Directors (And Other Officers)
| Concept | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | As at 2025-06-27 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Directors (and other officers) | ||||||||||
| Information about directors (and corporate auditors) | ||||||||||
| Official title or position | 
                                                取締役研究開発部門担当
                                                
                                             | 
                                                取締役
                                                
                                             | 
                                                代表取締役社長
                                                
                                             | 
                                                取締役
                                                
                                             | 
                                                監査役
                                                
                                             | 
                                                取締役管理部門担当
                                                
                                             | 
                                                取締役
                                                
                                             | 
                                                常勤監査役
                                                
                                             | — | 
                                                監査役
                                                
                                             | 
| Name | 
                                                飯塚 健蔵
                                                
                                             | 
                                                小南 欽一郎
                                                
                                             | 
                                                江島 淸
                                                
                                             | 
                                                岸井 幸生
                                                
                                             | 
                                                木村 正弥
                                                
                                             | 
                                                黒滝 健一
                                                
                                             | 
                                                谷口 明史
                                                
                                             | 
                                                前田 真明
                                                
                                             | — | 
                                                山本 昇平
                                                
                                             | 
| Date of birth | 
                                                1963-03-01
                                                
                                             | 
                                                1967-01-20
                                                
                                             | 
                                                1949-08-20
                                                
                                             | 
                                                1979-01-23
                                                
                                             | 
                                                1956-02-12
                                                
                                             | 
                                                1965-06-29
                                                
                                             | 
                                                1976-10-28
                                                
                                             | 
                                                1957-01-06
                                                
                                             | — | 
                                                1980-06-03
                                                
                                             | 
| Career summary | — | |||||||||
| Term of office | 
                                                (注)3
                                                
                                             | 
                                                (注)3
                                                
                                             | 
                                                (注)3
                                                
                                             | 
                                                (注)3
                                                
                                             | 
                                                (注)4
                                                
                                             | 
                                                (注)3
                                                
                                             | 
                                                (注)3
                                                
                                             | 
                                                (注)4
                                                
                                             | — | 
                                                (注)4
                                                
                                             | 
| Number of shares held (Ordinary shares) | 
                                                85,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                832,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                15,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                932,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             |