Directors (And Other Officers)
| Concept | 
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                                
                                    
                                        As at 2025-01-28  | 
                            
                        
|---|---|---|---|---|---|---|---|---|---|
| Directors (and other officers) | |||||||||
| Information about directors (and corporate auditors) | |||||||||
| Official title or position | 
                                        
                                             
                                                取締役
(監査等委員)
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役
(監査等委員)
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役
(監査等委員)
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                常務取締役
企画営業部長
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                取締役
工事部長
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役
東海支社長
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                代表取締役社長
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                取締役
管理部長
                                                
                                             
                                        
                                     | 
                                
                            
| Name | 
                                        
                                             
                                                田村 一美
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                城島 美香
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                水永 誠二
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                中山 成人
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                西村 幸雄
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                田中 武志
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                中島 雄司
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                藤本 智章
                                                
                                             
                                        
                                     | 
                                
                            
| Date of birth | 
                                        
                                             
                                                1949-07-27
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1967-03-16
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1959-01-12
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1971-01-15
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                1969-04-06
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1976-09-25
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1957-06-08
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1963-12-26
                                                
                                             
                                        
                                     | 
                                
                            
| Career summary | — | ||||||||
| Term of office | 
                                        
                                             
                                                (注)4
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)4
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                (注)3
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held (Ordinary shares) | 
                                        
                                             
                                                900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                5,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                100
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                357,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                338,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                10,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     |