Shinjuku, Tokyo held a local election for the city assembly on April 22, 2007 as part of the 16th unified regional elections.
| Parties | Votes | % | Seats |
|---|---|---|---|
| Liberal Democratic Party of Japan (自由民主党, Jiyū Minshutō) | 23,018 | 10 | |
| New Komeito party (公明党, Kōmeitō) | 19,806 | 9 | |
| Japanese Communist Party (日本共産党, Nihon Kyōsan-tō) | 15,642 | 8 | |
| Democratic Party of Japan (民主党, Minshutō) | 10,990 | 5 | |
| New Socialist Party (新社会党, Shin-Shakaitō) | 2,358 | 1 | |
| Social Democratic Party (社民党 Shamin-tō) | 2,108 | 1 | |
| Independents | 8,216 | 4 | |
| Total (turnout 40.15%) | N/A | 100.00 | 38 |
| Source:[1] | |||