| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Koichiro•Hirayama | |
| Used name | Koichiro•Hirayama | |
| Original name | 平山•紘一郎 | |
| Born | 9 September 1946 in ?, Kagoshima |  JPN |
| Measurements | 156 cm / 58 kg | |
| NOC | Japan | JPN |
| Medals | OG |
| Gold | 0 |
| Silver | 1 |
| Bronze | 1 |
| Total | 2 |
Koichiro Hirayama had the following finishes at major championships – 1975 World Championship: 52.0 kg. Greco-Roman (4th); 1973 World Championship: 52.0 kg. Greco-Roman (6th); 1974 Asian Games: 52.0 kg. Greco-Roman (1st).
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1972 Summer Olympics | Wrestling | JPN |
Koichiro Hirayama | |||
| Flyweight, Greco-Roman, Men (Olympic) | 2 | Silver | ||||
| 1976 Summer Olympics | Wrestling | JPN |
Koichiro Hirayama | |||
| Flyweight, Greco-Roman, Men (Olympic) | 3 | Bronze |
