# Tokyo 10th district

Tokyo 10th district is a constituency of the House of Representatives in the Diet of Japan (national legislature). As of 2012, 351,821 eligible voters were registered in the district. The district is located in the central area of the former city of Tokyo. After redistricting in 2022 it comprises the wards of Toshima and Bunkyō. Previously it had covered Toshima and a part of Nerima ward.
Before the electoral reform of 1994, the area had been part of Tokyo 5th district where three Representatives had been elected by single non-transferable vote. Until her successful gubernatorial bid in 2016, Liberal Democrat Yuriko Koike had represented the district. Koike, formerly a representative for Hyōgo 6th district, had taken over Tokyo 10th district in 2005 as one of Jun'ichirō Koizumi's "female assassins" to take out postal privatization rebel Kōki Kobayashi. In the landslide election of 2009, she lost the district to Takako Ebata (DPJ, Ozawa group), one of the so-called "Ozawa girls" (小沢ガールズ, Ozawa gāruzu), a group of female first-time candidates handpicked by DPJ ex-chairman Ichirō Ozawa.
The current representative, elected in the 2017 general election, is Hayato Suzuki.

## List of representatives

| Representative | Party | Dates | Notes |
| Kōki Kobayashi | LDP | 1996–2005 | Postal privatization rebel in 2005, joined New Party Nippon |
| Yuriko Koike | LDP | 2005–2009 | Re-elected in the Tokyo PR block, minister of state in the 2nd and 3rd Koizumi Cabinets and the 1st Abe Cabinet |
| Takako Ebata | DPJ | 2009–2012 | Failed re-election in the Tokyo block |
| Yuriko Koike | LDP | 2012–2016 | Forfeited seat on July 14, 2016 when she became a candidate in the gubernatorial election |
| Vacant (July – October 2016) |||||
| Masaru Wakasa | LDP | 2016–2017 | Submitted his resignation from the LDP ahead of the 2017 Tokyo prefectural election to support Koike's new party. The LDP accepted his exit on July 3, 2017. |
| Masaru Wakasa | Kibō | 2017 | Submitted his resignation from the LDP ahead of the 2017 Tokyo prefectural election to support Koike's new party. The LDP accepted his exit on July 3, 2017. |
| Hayato Suzuki | LDP | 2017– | |

## Election results

2024 :
| Party | Party | Candidate |
| | LDP | Hayato Suzuki |
| | CDP | Yōsuke Suzuki |
| | Ishin | Hiroko Nagano |
| | Sanseitō | Shin Yasuda |
| Turnout | Turnout | Turnout |
2021 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Hayato Suzuki (supported by Kōmeitō) | 115,122 | 43.80 | 6.43 |
| | CDP | Yōsuke Suzuki (elected by PR) | 107,920 | 41.06 | 12.29 |
| | Ishin | Takashi Fujikawa | 30,574 | 11.63 | |
| | Independent | Tōru Koyama | 4,684 | 1.78 | 0.92 |
| | New Party for Japanese Kokoro | Yūji Sawaguchi | 4,552 | 1.73 | |
| Turnout | Turnout | Turnout | | 56.50 | 3.55 |
| | LDP hold | LDP hold | Swing | 2.4 | |
2017 :
| Party | Candidate | Votes | % | ±% |
| LDP | Hayato Suzuki (supported by Kōmeitō) | 91,146 | 37.4 | N/A |
| CDP | Yōsuke Suzuki | 70,168 | 28.8 | N/A |
| Kibō no Tō | Masaru Wakasa | 57,901 | 23.7 | −36.6 |
| JCP | Yoshinobu Kishi | 20,828 | 8.5 | N/A |
| Independent | Tōru Koyama | 2,107 | 0.9 | N/A |
| Happiness Realization | Toshimitsu Yoshii | 1,744 | 0.7 | −1.5 |
2016 by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP (K) | Masaru Wakasa | 75,755 | 60.3 | new |
| | DP (Seikatsusha Net, SDP) | Yōsuke Suzuki | 47,141 | 37.5 | new |
| | HRP | Toshimitsu Yoshii | 2,824 | 2.2 | new |
| Turnout | Turnout | Turnout | 127,965 | 37.85 | −18.71 |
2014 :
| Party | Candidate | Votes | % | ±% |
| LDP (K) | Yuriko Koike | 93,610 | 50.7 | −3.0 |
| DPJ | Takako Ebata | 44,123 | 23.9 | +0.5 |
| JCP | Hideko Kon | 28,453 | 15.4 | +4.5 |
| PLP | Ryō Tagaya | 9,663 | 5.2 | −6.8 |
| PFG | Chizuko Kamitani | 8,688 | 4.7 | new |
2012 :
| Party | Candidate | Votes | % | ±% |
| LDP (NK) | Yuriko Koike | 108,983 | 53.7 | +10.4 |
| DPJ (PNP) | Takako Ebata | 47,493 | 23.4 | −23.8 |
| TPJ (NPD) | Ryō Tagaya | 24,414 | 12.0 | +12.0 |
| JCP | Hideko Kon | 22,044 | 10.9 | +1.5 |
2009 :
| Party | Party | Candidate | Votes | % | ±% |
| | DPJ (PNP support) | Takako Ebata | 105,512 | 47.2 | +24.2 |
| | LDP (Kōmeitō support) | Yuriko Koike (elected by PR) | 96,739 | 43.3 | −6.8 |
| | JCP | Toshie Yamamoto | 21,092 | 9.4 | +1.2 |
| Turnout | Turnout | Turnout | 227,220 | 65.66 | |
2005 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Yuriko Koike | 109,764 | 50.1 | +4.9 |
| | Democratic | Muneaki Samejima | 50,536 | 23.0 | −19.7 |
| | New Party Nippon | Kōki Kobayashi | 41,089 | 18.7 | +18.7 |
| | JCP | Toshie Yamamoto | 17,929 | 8.2 | −2.5 |
| Turnout | Turnout | Turnout | 222,096 | 66.55 | |
2003 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Kōki Kobayashi | 81,979 | 45.2 | +6.4 |
| | Democratic | Muneaki Samejima (elected by PR) | 77,417 | 42.7 | +7.8 |
| | JCP | Toshie Yamamoto | 19,338 | 10.7 | −5.6 |
| | Japan Nation Party | Sakae Shirai | 2,706 | 1.4 | +1.4 |
| Turnout | Turnout | Turnout | 187,204 | 56.27 | |
2000 :
| Party | Candidate | Votes | % | ±% |
| LDP | Kōki Kobayashi | 71,318 | 38.8 | −8.1 |
| Democratic | Muneaki Samejima (elected by PR) | 64,272 | 34.9 | +34.9 |
| JCP | Toshie Yamamoto | 29,907 | 16.3 | +0.4 |
| LP | Hiromasa Hotta | 18,509 | 10.1 | +10.1 |
1996 :
| Party | Party | Candidate | Votes | % |
| | LDP | Kōki Kobayashi | 52,787 | 30.7 |
| | New Frontier | Muneaki Samejima | 45,536 | 26.4 |
| | Democratic | Akira Nagatsuma | 33,480 | 19.4 |
| | JCP | Ken Nakano | 27,230 | 15.8 |
| | Social Democratic | Hideki Tanaka | 8,394 | 4.9 |
| | Independent | Akito Kamojima | 4,745 | 2.8 |
| Turnout | Turnout | Turnout | 176,190 | 55.59 |