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Tokyo 20th district

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Electoral district in Tokyo, Japan

Tokyo 20th District
東京都第20区
Parliamentary constituency for theJapanese House of Representatives

Prefecture	Tokyo
Proportional Block	Tokyo
Electorate	419,465 (as of 1 September 2022)^[1]
Current constituency
Created	1994
Seats	One
Party	LDP
Representative	Seiji Kihara

Tokyo 20th District (東京都第20区,Tokyo-to dai-niju-ku) is anelectoral district of theJapanese House of Representatives. The district was created in 1994 as part of the move to single-member districts that same year, and the district is currently represented by theLiberal Democratic Party's Seiji Kihara.

Areas covered

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As of 13 January 2023, the areas covered by this district area as follows:^[2]^[3]

Since its creation in 1994, the borders of this district have so far not been changed.

Elected representatives

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Representative		Years served	Notes
Yuriko Ono	NFP	1996-2000
Koichi Kato	DPJ	2000-2005
Seiji Kihara	LDP	2005-2009
Koichi Kato	DPJ	2009-2012
Seiji Kihara	LDP	2012-	Incumbent

Election results

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‡ - Also ran in theTokyo PR district

‡‡ - Also ran and won in theTokyo PR district

2024^[4]
Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara	93,390	43.03	9.57
	DPP	Kentarō Oonishi	65,435	30.15	New
	JCP	Toru Miyamoto	58,215	26.82	1.98
Registered electors			417,159
Turnout			216,950	54.58	2.22

2021^[5]
Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara^‡(incumbent) (endorsed byKomeito)	121,621	52.6	2.7
	JCP	Toru Miyamoto^‡(incumbent -Tokyo PR) (endorsed by theSDP)	66,516	28.8	2.0
	Ishin	Junichiro Maeda^‡	43,089	18.6	New
Registered electors			418,245
Turnout			237,438	56.8	3.2
	LDPhold		Swing	2.5

2017^[6]
Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara^‡(incumbent) (endorsed byKomeito)	107,686	49.9	2.2
	JCP	Toru Miyamoto^‡(incumbent -Tokyo PR) (endorsed by theSDP)	57,741	26.8	2.5
	Kibō no Tō	Akira Shikano^‡	50,439	23.4	New
Registered electors			415,565
Turnout			222,909	53.6	0.9
	LDPhold		Swing	7.0

2014^[7]
Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara^‡(incumbent) (endorsed byKomeito)	110,273	52.1	11.7
	Democratic	Mitsuaki Takeda^‡ (endorsed by theJIP)	51,362	24.3	1.1
	JCP	Mariko Ikeda	49,902	23.6	10.0
Registered electors			404,949
Turnout			220,576	54.5	3.2
	LDPhold		Swing	8.1

2012^[8]
Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara^‡ (endorsed byKomeito)	98,070	40.4	4.4
	Democratic	Koichi Kato^‡(incumbent) (endorsed by thePNP)	61,519	25.4	25.8
	Restoration	Kazusa Noda^‡	50,031	20.6	New
	JCP	Mariko Ikeda	33,092	13.6	1.8
Registered electors			402,763
Turnout			254,264	63.1	5.0
	LDPgain fromDemocratic		Swing	5.5

2009^[9]
Party		Candidate	Votes	%	±%
	Democratic	Koichi Kato^‡(incumbent -Tokyo PR) (endorsed by theSDP)	136,294	51.2	2.7
	LDP	Seiji Kihara^‡(incumbent)	95,718	36.0	6.6
	JCP	Mariko Ikeda^‡	31,475	11.8	1.0
	Happiness Realization	Kazuyuki Abe	2,560	1.0	New
Registered electors			398,174
Turnout			271,157	68.1	1.1
	Democraticgain fromLDP		Swing	5.1

2005^[10]
Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara^‡	112,634	44.6	7.4
	Democratic	Toru Miyamoto^‡‡(incumbent)	107,916	42.7	8.0
	JCP	Mariko Ikeda^‡	32,299	12.8	0.7
Registered electors			388,041
Turnout			259,794	67.0	6.9
	LDPgain fromDemocratic		Swing	3.7

2003^[11]
Party		Candidate	Votes	%	±%
	Democratic	Koichi Kato^‡(incumbent)	111,041	50.7	11.2
	LDP	Seiichiro Shimizu^‡	81,588	37.2	New
	JCP	Mariko Ikeda	26,434	12.1	3.1
Registered electors			380,991
Turnout			237,438	60.1	4.8
	Democratichold		Swing	15.2

2000^[12]
Party		Candidate	Votes	%	±%
	Democratic	Koichi Kato^‡	93,236	39.5	19.2
	Komeito	Yuriko Ono^‡	58,613	24.8	2.0
	Independent	Seiichiro Shimizu	48,613	20.6	New
	JCP	Ikuo Suzuki	35,826	15.2	1.9
Registered electors			371,592
Turnout			241,052	64.9
	Democraticgain fromNew Frontier		Swing	9.6

1996^[13]
Party		Candidate	Votes	%	±%
	New Frontier	Yuriko Ono	55,559	27.0	*New*
	LDP	Seiichiro Shimizu^‡	54,582	26.5	New
	Democratic	Shino Nakano^‡	41,705	20.3	New
	JCP	Nobuhiro Maesawa	35,150	17.1	New
	Independent	Naoko Asaki	13,957	6.8	New
	New Socialist	Etsuko Nagata	4,878	2.4	New
Registered electors			360,803
Turnout			210,925	58.5	N/A
	New Frontierwin (new seat)

References

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^"令和4年9月1日現在選挙人名簿及び在外選挙人名簿登録者数" [Ministry of Internal Affairs and Communications - Number of registered voters as of 1 September 2022].Ministry of Internal Affairs and Communications (in Japanese). Retrieved2023-01-13.
^"法律第百四号（平六・一一・二五）".www.shugiin.go.jp.Japanese House of Representatives. 1994. Retrieved2023-01-13.
^"東京都" [Tokyo](PDF).Ministry of Internal Affairs and Communications (in Japanese). 2022. Retrieved2023-01-13.
^日本放送協会."衆議院選挙2024 埼玉(川越・越谷など)開票速報・選挙結果 NHK".www.nhk.or.jp (in Japanese). Retrieved2025-03-31.
^"東京20区 - 第49回衆議院議員選挙" [Tokyo 20th District - 49th House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第48回衆議院議員選挙" [Tokyo 20th District - 48th House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第47回衆議院議員選挙" [Tokyo 20th District - 47th House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第46回衆議院議員選挙" [Tokyo 20th District - 46th House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第45回衆議院議員選挙" [Tokyo 20th District - 45th House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第44回衆議院議員選挙" [Tokyo 20th District - 44th House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第43回衆議院議員選挙" [Tokyo 20th District - 43rd House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第42回衆議院議員選挙" [Tokyo 20th District - 42nd House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.
^"東京20区 - 第41回衆議院議員選挙" [Tokyo 20th District - 41st House of Representatives General Election].go2senyko.com (in Japanese). Retrieved2023-01-13.

Electoral districts ofTokyo for theNational Diet ofJapan

House of Representatives

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 26 27 28 29 30 (25→30 majoritarian Representatives)
PR regional "block" districts (1996–present)	Tokyo PR block (19→17→19 proportional Representatives)
SNTV "medium-sized" districts (1947–1993)	1 2 3 4 5 6 7 8 9 10 11 (43 Representatives)
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)

House of Councillors (1947–)

At-large (8→10→12 Councillors)

House of Peers (1890–1947)

At-large (1→2 elected top taxpayer Peers)

v t e First-past-the-post (FPTP) districts andproportional representation (PR) "blocks" for the JapaneseHouse of Representatives of theNational Diet (1996–present)
Speaker of the House of Representatives of Japan:Fukushiro Nukaga,Ibaraki 2nd Vice Speaker of the House of Representatives of Japan:Banri Kaieda,Tokyo PR
Hokkaidō	Block 8 seats Hokkaidō 1 2 3 4 5 6 7 8 9 10 11 12
Tōhoku	Block 12 seats Aomori 1 2 3 Iwate 1 2 3 Miyagi 1 2 3 4 5 Akita 1 2 3 Yamagata 1 2 3 Fukushima 1 2 3 4
Kita- (North)Kantō	Block 19 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 16
Minami- (South)Kantō	Block 23 seats Chiba 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Kanagawa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Yamanashi 1 2
Tokyo	Block 19 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 26 27 28 29 30
Hokuriku-Shin'etsu	Block 10 seats Niigata 1 2 3 4 5 Toyama 1 2 3 Ishikawa 1 2 3 Fukui 1 2 Nagano 1 2 3 4 5
Tōkai	Block 21 seats Gifu 1 2 3 4 5 Shizuoka 1 2 3 4 5 6 7 8 Aichi 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Mie 1 2 3 4
Kinki	Block 28 seats Shiga 1 2 3 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 Wakayama 1 2
Chūgoku	Block 10 seats Tottori 1 2 Shimane 1 2 Okayama 1 2 3 4 Hiroshima 1 2 3 4 5 6 Yamaguchi 1 2 3
Shikoku	Block 6 seats Tokushima 1 2 Kagawa 1 2 3 Ehime 1 2 3 Kōchi 1 2
Kyūshū	Block 20 seats Fukuoka 1 2 3 4 5 6 7 8 9 10 11 Saga 1 2 Nagasaki 1 2 3 Kumamoto 1 2 3 4 Ōita 1 2 3 Miyazaki 1 2 3 Kagoshima 1 2 3 4 Okinawa 1 2 3 4
Former districts	Abolished in 2002 Hokkaido 13 Yamagata 4 Shizuoka 9 Shimane 3 Oita 4 Abolished in 2013 Fukui 3 Yamanashi 3 Tokushima 3 Kochi 3 Saga 3 Abolished in 2017 Aomori 4 Iwate 4 Mie 5 Nara 4 Kumamoto 5 Kagoshima 5 Abolished in 2022 Miyagi 6 Fukushima 5 Niigata 6 Shiga 4 Wakayama 3 Okayama 5 Hiroshima 7 Yamaguchi 4 Ehime 4 Nagasaki 4

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