| State | Japan |
| Treaty | Outer Space Treaty |
| Action Type | Ratification |
| Depositary | Government of the United Kingdom |
| Date | 10 October 1967 |
| Other Actions | Signature on deposit with London — 27 January 1967 Ratification on deposit with Moscow — 10 October 1967 Signature on deposit with Moscow — 27 January 1967 Ratification on deposit with Washington — 10 October 1967 Signature on deposit with Washington — 27 January 1967 |