| ONSEN LIMITED | Private company limited by shares | Live |
| ONSEN CPA LIMITED | Private company limited by shares | Live |
| CAFE ONSEN TAMAGO LIMITED | Private company limited by shares | Live |
| ONSEN INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| ONSEN ELECTRONICS LIMITED | | Live |
| ONSEN GROUP CO LIMITED | | Live |
| ONSEN INDUSTRY GROUP COMPANY LIMITED | Private company limited by shares | Live |
| Onsen Metal Industrial Limited | Private company limited by shares | Live |
| ONSEN TRADING LIMITED | Private company limited by shares | Dissolved |
| ONSENG LIMITED | Private company limited by shares | Live |
| FRANCE ONSENSE HOLDING LIMITED | Private company limited by shares | Live |
| ONSENSE SHIPPING LIMITED | Private company limited by shares | Live |