Tokyo 20th district

Tokyo 20th District (東京都第20区, Tokyo-to dai-niju-ku) is an electoral district of the Japanese 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 the Liberal Democratic Party's Seiji Kihara.

Tokyo 20th District
東京都第20区
Parliamentary constituency for the Japanese 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

Areas covered

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

• Higashimurayama
• Higashiyamato
• Kiyose
• Higashikurume
• Musashimurayama

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

Elected representatives

Representative	Party		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

‡ - Also ran in the Tokyo PR district

‡‡ - Also ran and won in the Tokyo 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 by Komeito)	121,621	52.6	2.7
	JCP	Toru Miyamoto‡ (incumbent - Tokyo PR) (endorsed by the SDP)	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
	LDP hold		Swing	2.5

2017^[6]

Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara‡ (incumbent) (endorsed by Komeito)	107,686	49.9	2.2
	JCP	Toru Miyamoto‡ (incumbent - Tokyo PR) (endorsed by the SDP)	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
	LDP hold		Swing	7.0

2014^[7]

Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara‡ (incumbent) (endorsed by Komeito)	110,273	52.1	11.7
	Democratic	Mitsuaki Takeda‡ (endorsed by the JIP)	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
	LDP hold		Swing	8.1

2012^[8]

Party		Candidate	Votes	%	±%
	LDP	Seiji Kihara‡ (endorsed by Komeito)	98,070	40.4	4.4
	Democratic	Koichi Kato‡ (incumbent) (endorsed by the PNP)	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
	LDP gain from Democratic		Swing	5.5

2009^[9]

Party		Candidate	Votes	%	±%
	Democratic	Koichi Kato‡ (incumbent - Tokyo PR) (endorsed by the SDP)	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
	Democratic gain from LDP		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
	LDP gain from Democratic		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
	Democratic hold		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
	Democratic gain from New 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 Frontier win (new seat)