Tokyo 10th district

Tokyo 10th district is a constituency of the House of Representatives in the Diet of Japan (national legislature). It is located in Tokyo and covers northwestern parts of the former city of Tokyo. The district consists of the wards of Toshima and parts of Nerima. As of 2012, 351,821 eligible voters were registered in the district.^[1]

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.

The latest representative from the 10th district was Liberal Democrat Yuriko Koike. 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.

List of Representatives

Representative		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	Vacated seat on July 14, 2016 when she became a candidate in the gubernatorial election^[2]
Vacant, by-election on 23 October 2016

Election results

2014^[3]
	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^[4]
	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^[5]
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			227,220	65.66

2005^[6]
Party		Candidate	Votes	%	±
	Liberal Democratic	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
	Communist	Toshie Yamamoto	17,929	8.2	-2.5
Turnout			222,096	66.55

2003^[7]
Party		Candidate	Votes	%	±
	Liberal Democratic	Kōki Kobayashi	81,979	45.2	+6.4
	Democratic	Muneaki Samejima (elected by PR)	77,417	42.7	+7.8
	Communist	Toshie Yamamoto	19,338	10.7	-5.6
	Japan Nation Party	Sakae Shirai	2,706	1.4	+1.4
Turnout			187,204	56.27

2000^[8]
	Candidate	Votes	%	±
Liberal Democratic	Kōki Kobayashi	71,318	38.8	-8.1
Democratic	Muneaki Samejima (elected by PR)	64,272	34.9	+34.9
Communist	Toshie Yamamoto	29,907	16.3	+0.4
LP	Hiromasa Hotta	18,509	10.1	+10.1

1996^[9]
Party		Candidate	Votes	%
	Liberal Democratic	Kōki Kobayashi	52,787	30.7
	New Frontier	Muneaki Samejima	45,536	26.4
	Democratic	Akira Nagatsuma	33,480	19.4
	Communist	Ken Nakano	27,230	15.8
	Social Democratic	Hideki Tanaka	8,394	4.9
	Independent	Akito Kamojima	4,745	2.8
Turnout			176,190	55.59

References

↑ Ministry of Internal Affairs and Communications (MIC): 平成21年9月2日現在における選挙人名簿及び在外選挙人名簿登録者数の概要 (Japanese)
↑ Sankei News, July 14, 2016: 小池百合子氏、都知事選出馬で議員失職　１０月に衆院補選
↑ 総選挙2014>開票結果　小選挙区　東京. Yomiuri Shimbun (in Japanese). Retrieved 2016-08-01.
↑ 総選挙2012>開票結果　小選挙区　東京. Yomiuri Shimbun (in Japanese). Retrieved 2013-02-27.
↑ 衆議院>第45回衆議院議員選挙>東京都>東京10区. ザ･選挙 (in Japanese). JANJAN. Retrieved 2009-09-09. External link in |work= (help)
↑ 衆議院>第44回衆議院議員選挙>東京都>東京10区. ザ･選挙 (in Japanese). JANJAN. Retrieved 2010-09-09. External link in |work= (help)
↑ 衆議院>第43回衆議院議員選挙>東京都>東京10区. ザ･選挙 (in Japanese). JANJAN. Retrieved 2010-09-09. External link in |work= (help)
↑ 衆議院>第42回衆議院議員選挙>東京都>東京10区. ザ･選挙 (in Japanese). JANJAN. Retrieved 2010-09-09. External link in |work= (help)
↑ 衆議院>第41回衆議院議員選挙>東京都>東京10区. ザ･選挙 (in Japanese). JANJAN. Retrieved 2010-09-09. External link in |work= (help)

Tokyo's electoral districts for the Diet of Japan

FPTP "small" districts (1996–present) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 PR Tokyo PR block House of Councillors At-large (25 Representatives (PR block: 19→17), 8→10 Councillors)

SNTV "medium-sized" districts (1947–1993) 1 2 3 4 5 6 7 8 9 10 11 (43 Representatives, 8 Councillors)

Limited voting "large" districts (1946) 1 2 (22 Representatives)

SNTV "medium-sized" districts (1928–1942) 1 2 3 4 5 6 7 (31 Representatives)

FPTP/SNTV "small" districts (1920–1924) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 (25 Representatives)

SNTV "large" districts (1902–1917) Tokyo city counties (gunbu) (16 Representatives)

FPTP/bloc voting "small" districts (1890–1898) 1 2 3 4 5 6 7 8 9 10 11 12 (12 Representatives)

Single-member districts and proportional representation "blocks" for the Japanese House of Representatives since 1996

Speaker of the House of Representatives of Japan: Tadamori Ōshima, Aomori 3 Vice Speaker of the House of Representatives of Japan: Tatsuo Kawabata, Kinki PR

Hokkaidō proportional representation block - 8 seats	Hokkaidō 1 2 3 4 5 6 7 (7) 8 9 10 11 12 (13)

Tōhoku proportional representation block - 14 seats	Aomori 1 2 3 4 Iwate 1 2 3 4 Miyagi 1 2 3 4 5 6 Akita 1 2 3 Yamagata 1 2 3 (4) Fukushima 1 2 3 4 5

Kitakantō proportional representation block - 20 seats	Ibaraki 1 2 3 4 5 6 7 Tochigi 1 2 3 4 5 Gunma 1 2 3 4 5 Saitama 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Minamikantō proportional representation block - 22 seats	Chiba 1 2 3 4 5 6 7 8 9 10 11 12 13 Kanagawa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Yamanashi 1 2 (3)

Tokyo proportional representation block - 17 seats	Tokyo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Hokurikushin'etsu proportional representation block - 11 seats	Niigata 1 2 3 4 5 6 Toyama 1 2 3 Ishikawa 1 2 3 Fukui 1 2 (3) Nagano 1 2 3 4 5

Tōkai proportional representation block - 21 seats	Gifu 1 2 3 4 5 Shizuoka 1 2 3 4 5 6 7 8 (9) Aichi 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Mie 1 2 3 4 5

Kinki proportional representation block - 29 seats	Shiga 1 2 3 4 Kyoto 1 2 3 4 5 6 Osaka 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Hyōgo 1 2 3 4 5 6 7 8 9 10 11 12 Nara 1 2 3 4 Wakyama 1 2 3

Chūgoku proportional representation block - 11 seats	Tottori 1 2 Shimane 1 2 (3) Okayama 1 2 3 4 5 Hiroshima 1 2 3 4 5 6 7 Yamaguchi 1 2 3 4

Shikoku proportional representation block - 6 seats	Tokushima 1 2 (3) Kagawa 1 2 3 Ehime 1 2 3 4 Kōchi 1 2 (3)

Kyūshū proportional representation block - 21 seats	Fukuoka 1 2 3 4 5 6 7 8 9 10 11 Saga 1 2 (3) Nagasaki 1 2 3 4 Kumamoto 1 2 3 4 5 Ōita 1 2 3 (4) Miyazaki 1 2 3 Kagoshma 1 2 3 4 5 Okinawa 1 2 3 4

(in parentheses): districts eliminated in the 2002 and 2013 reapportionments

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