Directors (And Other Officers)
| Concept | 
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                                
                                    
                                        As at 2025-06-17  | 
                            
                        
|---|---|---|---|---|---|---|---|---|---|---|
| Directors (and other officers) | ||||||||||
| Information about directors (and corporate auditors) | ||||||||||
| Official title or position | 
                                        
                                             
                                                代表取締役社長執行役員
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                監査役
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役常務執行役員経営企画部長内部統制担当グループ連携担当未来挑戦部管掌
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役執行役員ウイストン株式会社社長
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                監査役
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                常勤監査役
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                取締役上席執行役員プラスチックカンパニー社長兼日本パリソン株式会社代表取締役社長
                                                
                                             
                                        
                                     | 
                                
                            
| Name | 
                                        
                                             
                                                石塚 久継
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                赤嶺 順也
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                畔柳 博史
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                杉浦  修
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                平田 健人
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                小栗  悟
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                北山  聡
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                安北 千差
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                稲本 弘希
                                                
                                             
                                        
                                     | 
                                
                            
| Date of birth | 
                                        
                                             
                                                1965-04-02
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1978-12-06
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1960-08-05
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1960-12-12
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1982-09-28
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1962-03-21
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1958-10-20
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1972-03-31
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                1968-03-25
                                                
                                             
                                        
                                     | 
                                
                            
| Career summary | — | |||||||||
| Term of office | 
                                        
                                             
                                                注4
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                注6
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                注4
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                注4
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                注6
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                注4
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                注5
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                注4
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                注4
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held (Ordinary shares) | 
                                        
                                             
                                                48,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                9,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                10,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                2,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                7,700
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                85,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                5,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     |