Shareholdings
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2023-12-31 | As at 2023-12-31 | 
|---|---|---|---|---|
| Shareholdings | ||||
| Reporting company | ||||
| Details of specified investment shares held for purposes other than pure investment | ||||
| Issue | 
                                                積水ハウス㈱
                                                
                                             | 
                                                ㈱池田泉州ホールディングス
                                                
                                             | — | — | 
| Number of shares | 
                                                3,030
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                371,540
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,779
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                371,540
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                11,461,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                147,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                                取引関係強化のために保有しております。また、取引先持株会に加入していることに伴う持分数増加のため株式数が増加しております。
                                                
                                             | 
                                                円滑な資金調達等の財務面での安全性・安定性を高めるために保有しております。
                                                
                                             | — | — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                無
                                                
                                             | 
                                                無(注2)
                                                
                                             | — | — |