| Chairman | Joji Matsumoto | State Minister without portfolio/ Professor Emeritus, Tokyo Imperial University |
| Adviser | Toru Shimizu | Vice Chairman, Privy Council/Member of the Imperial Academy |
| Tatsukichi Minobe | Member of the Imperial Academy/Professor Emeritus, Tokyo Imperial University | |
| Junji Nomura | Professor Emeritus, Tokyo Imperial University | |
| Member | Toshiyoshi Miyazawa | Professor, Tokyo Imperial University |
| Shiro Kiyomiya | Professor, Tohoku University | |
| Matasuke Kawamura | Professor, Kyushu University | |
| Takeshige Ishiguro | Chief Secretary, Privy Council | |
| Wataru Narahashi | Director General of the Bureau of Legislation | |
| Toshio Irie | Director of the First Department, Bureau of Legislation | |
| Tatsuo Sato | Director of the Second Department, Bureau of Legislation | |
| Assistant Member | Tadashi Gyobu | Professor, Tokyo Imperial University |
| Isao Sato | Lecturer, Tokyo Imperial University |
Source: Koseki, Shoichi. Shin kenpo no tanjo [The Birth of the New Constitution] Tokyo: Chuo Koronsha, 1989
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