| Country: | JPN |
| Type: | National |
| Route: | 504 |
| Map Custom: | yes |
| Length Km: | 145.1 |
| Length Ref: | [1] |
| Established: | 1993 |
| Direction A: | North |
| Terminus A: | in Kanoya, Kagoshima |
| Direction B: | South |
| Terminus B: | in Izumi, Kagoshima |
| Previous Type: | Route |
| Previous Route: | 503 |
| Next Type: | Route |
| Next Route: | 505 |
National Route 504 is a national highway of Japan connecting between Kanoya, Kagoshima and Izumi, Kagoshima in Japan, with total length has 145.1km (90.2miles).