# Tokyo 21st district

Tokyo 21st district (東京都第21区, Tokyo-to dai-ni-juikku or simply 東京21区, Tokyo-ni-juikku) is a single-member constituency of the House of Representatives in the national Diet of Japan located in Tokyo.
The incumbent candidate, former Foreign Affairs Senior Vice Minister Kiyoshi Odawara, was not endorsed by the LDP because of involvement in the 2023–2024 Japanese slush fund scandal and ran as an independent candidate.

## List of representatives

| Election | Representative | Party | Dates |
| 1996 | Jōji Yamamoto [ja] | DPJ | 1996–1998 |
| 1996 | Jōji Yamamoto [ja] | DPJ | 1998-2000 |
| 2000 | Jōji Yamamoto [ja] | DPJ | 1998-2000 |
| 2000 | Etsuko Kawada [ja] | Indep. | 2000-2003 |
| 2003 | Akihisa Nagashima | DPJ | 2003–2005 |
| 2005 | Yuichi Ogawa | LDP | 2005–2009 |
| 2009 | Akihisa Nagashima | DPJ | 2009–2014 |
| 2012 | Akihisa Nagashima | DPJ | 2009–2014 |
| 2014 | Kiyoshi Odawara [ja] | LDP | 2014-2017 |
| 2017 | Akihisa Nagashima | Kibō | 2017-2018 |
| 2017 | Akihisa Nagashima | Indep. | 2018-2019 |
| 2017 | Akihisa Nagashima | LDP | 2019-2021 |
| 2021 | Kiyoshi Odawara | LDP | 2021–present |

## Election results

2024 :
| Party | Party | Candidate |
| | Independent | Kiyoshi Odawara [ja] |
| | Constitutional Democratic | Masako Ōkawara |
| | Ishin | Yōko Yamashita |
| | Sanseitō | Yūichi Mori |
| Turnout | Turnout | Turnout |
2021 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Kiyoshi Odawara (incumbent-Tokyo-PR) | 112,433 | 45.51 | 6.37 |
| | CDP | Masako Ōkawara (incumbent-Northern Kanto-PR) (elected by Tokyo-PR) | 99,090 | 40.11 | New |
| | Ishin | Mitsuaki Takeda [ja] | 35,527 | 14.38 | New |
| Registered electors | Registered electors | Registered electors | 438,466 | | |
| Turnout | Turnout | Turnout | | 57.72 | 3.54 |
2017 :
| Party | Party | Candidate | Votes | % | ±% |
| | Kibō | Akihisa Nagashima (incumbent-Tokyo-PR) | 92,356 | 40.97 | New |
| | LDP | Kiyoshi Odawara (incumbent) (elected by Tokyo-PR) | 88,225 | 39.14 | 2.45 |
| | SDP | Kensuke Koito | 38,195 | 16.94 | 7.16 |
| | Indep. | Naoto Amaki [ja] | 6,655 | 2.95 | New |
| Registered electors | Registered electors | Registered electors | 429,529 | | |
| Turnout | Turnout | Turnout | | 54.18 | 0.09 |
2014 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Kiyoshi Odawara (incumbent-Tokyo-PR) | 83,984 | 41.59 | 10.75 |
| | DPJ | Akihisa Nagashima (incumbent) (elected by Tokyo-PR) | 82,351 | 40.78 | 4.33 |
| | JCP | Masafumi Yoshioka | 35,598 | 17.63 | 8.05 |
| Registered electors | Registered electors | Registered electors | 383,589 | | |
| Turnout | Turnout | Turnout | | 54.27 | 7.79 |
2012 :
| Party | Party | Candidate | Votes | % | ±% |
| | DPJ | Akihisa Nagashima (incumbent) | 82,831 | 36.45 | 21.17 |
| | LDP | Kiyoshi Odawara (elected by Tokyo-PR) | 70,070 | 30.84 | 1.37 |
| | JRP | Rie Sasaki [ja] | 36,734 | 16.17 | New |
| | JCP | Masafumi Yoshioka | 21,762 | 9.58 | 1.02 |
| | TP | Yūji Fujita | 11,408 | 5.02 | New |
| | Indep. | Hiroyuki Tanikawa | 4,413 | 1.94 | New |
| Registered electors | Registered electors | Registered electors | 381,396 | | |
| Turnout | Turnout | Turnout | | 62.06 | 4.56 |
2009 :
| Party | Party | Candidate | Votes | % | ±% |
| | DPJ | Akihisa Nagashima (incumbent-Tokyo-PR) | 142,418 | 57.62 | 16.00 |
| | LDP | Yuichi Ogawa (incumbent) | 79,628 | 32.21 | 13.86 |
| | JCP | Atsumaro Hoshi | 21,155 | 8.56 | 2.18 |
| | HRP | Atsushi Yamamoto | 3,976 | 1.61 | New |
| Registered electors | Registered electors | Registered electors | 377,839 | | |
| Turnout | Turnout | Turnout | | 66.62 | 0.50 |
2005 :
| Party | Party | Candidate | Votes | % | ±% |
| | LDP | Yuichi Ogawa | 109,310 | 46.07 | 11.47 |
| | DPJ | Akihisa Nagashima (incumbent) (elected by Tokyo-PR) | 98,749 | 41.62 | 2.43 |
| | JCP | Yutaka Tagawa | 25,483 | 10.74 | 2.36 |
| | Indep. | Yutaka Sogō | 3,739 | 1.58 | New |
| Registered electors | Registered electors | Registered electors | 366,405 | | |
| Turnout | Turnout | Turnout | | 66.12 | 6.95 |
2003 :
| Party | Party | Candidate | Votes | % | ±% |
| | DPJ | Akihisa Nagashima | 81,398 | 39.19 | 20.65 |
| | LDP | Jōji Hashimoto | 71,873 | 34.60 | 0.48 |
| | Indep. | Etsuko Kawada [ja] (incumbent) | 37,019 | 17.82 | 18.78 |
| | JCP | Yutaka Tagawa | 17,409 | 8.38 | 9.00 |
| Registered electors | Registered electors | Registered electors | 360,711 | | |
| Turnout | Turnout | Turnout | | 59.17 | 2.47 |
By-election, October 22, 2000 :
| Party | Party | Candidate | Votes | % | ±% |
| | Indep. | Etsuko Kawada | 51,008 | 36.60 | New |
| | LDP | Sekikazu Kato | 48,883 | 35.08 | 0.05 |
| | DPJ | Akihisa Nagashima | 25,843 | 18.54 | 28.95 |
| | SDP | Teiko Kidō | 13,627 | 9.78 | New |
| Turnout | Turnout | Turnout | | | |
2000 :
| Party | Party | Candidate | Votes | % | ±% |
| | DPJ | Jōji Yamamoto [ja] | 98,775 | 47.49 | New |
| | LDP | Sekikazu Kato | 73,067 | 35.13 | 9.42 |
| | JCP | Yasuo Sugita | 36,150 | 17.38 | 3.53 |
| Registered electors | Registered electors | Registered electors | 348,869 | | |
| Turnout | Turnout | Turnout | | 61.65 | |
1996 :
| Party | Party | Candidate | Votes | % | ±% |
| | DPJ | Jōji Yamamoto | 55,458 | 28.91 | New |
| | LDP | Kiyoshi Ozawa [ja] (elected by Tokyo-PR) | 49,308 | 25.71 | New |
| | NFP | Toshiaki Koga [ja] | 46,919 | 24.46 | New |
| | JCP | Emi Iwasa [ja] | 40,114 | 20.91 | New |
| Turnout | Turnout | Turnout | | | |