Chiba at-large district

The Chiba at-large district (Japanese: 千葉県選挙区, Hepburn: Chiba-ken senkyoku) is a constituency that represents Chiba Prefecture in the House of Councillors in the Diet of Japan. It has six Councillors in the 242-member house.

Chiba at-large district
千葉県選挙区
Parliamentary constituency for the House of Councillors
Prefecture	Chiba
Electorate	5,279,312 (as of September 2022)[1]
Current constituency
Created	1947
Seats	6
Councillors	Class of 2019:   Junichi Ishii (LDP)   Hiroyuki Nagahama (CDP)   Toshiro Toyota (LDP) Class of 2022:   Shoichi Usui (LDP)   Kuniko Inoguchi (LDP)   Hiroyuki Konishi (CDP)

Outline

The constituency represents the entire population of Chiba Prefecture. The district elects six Councillors to six-year terms, two sets of three each at alternating elections held every three years. Prior to the 2007 election the district elected four Councilors in two sets of two. The district has 5,092,741 registered voters as of September 2015.^[2] The Councillors currently representing Chiba are:

• Kuniko Inoguchi (Liberal Democratic Party (LDP), first term; term ends in 2016)^[3]
• Hiroyuki Konishi (Democratic Party, first term; term ends in 2016)^[4]
• Kenichi Mizuno (Democratic Party, first term; term ends in 2016)^[5]
• Junichi Ishii (LDP, second term; term ends in 2019)^[6]
• Hiroyuki Nagahama (Democratic Party, second term; term ends in 2019)^[7]
• Toshiro Toyoda (LDP, first term; term ends in 2019)^[8]

Elected Councillors

Class of 1947			election year	Class of 1950 (3-year term in 1947)
-	Akira Ono (Ind.)[note 1]	Hisashi Yamazaki (Ind.)[note 2]	1947	Yoshiaki Tamaya (Liberal)	Ichiro Asai (Democratic)	-
			1950	Kinsuke Kanō (Liberal)[note 3]	Toshizō Tsuchiya[note 4] (Liberal)
			1950 by-election[note 5]		Fumie Kataoka (Social Democratic)
	Kan Kase (Ind.)[note 6]	Tamenosuke Kawaguchi (Liberal)	1953
			1954 by-election[note 7]	Shigejiro Inō (Liberal)
			1956	Shigejirō Inō[note 8] (LDP)
	Kan Kase (Social Democratic)	Kyūtarō Ozawa[note 9] (LDP)	1959
			1960 by-election[note 10]	Yoshio Kijima (LDP)
			1962		Akio Yanaoka (Social Democratic)
			1965
		Gisaku Sugeno[note 11] (LDP)	1967 by-election[note 12]
			1968		Ichitaro Watanabe (LDP)
			1971
			1974	Takayoshi Takahashi (LDP)	Misao Akagiri (Social Democratic)
			1977
			1980	Yutaka Inoue[note 13] (LDP)
		Sōichi Usui (LDP)	1981 by-election[note 14]
	Yaeko Itohisa (Social Democratic)	Hiroyuki Kurata (LDP)	1983
			1986
			1989
			1992
	Ryōzō Iwase (New Frontier)		1995
			1998		Wakako Hironaka (Ind.)[note 15]
	Akira Imaizumi (DPJ)		2001
			2002 by-election[note 16]	Kazuyasu Shiina (LDP)
			2004[13]		Wakako Hironaka (DPJ)
Ken Kagaya (DPJ)	Hiroyuki Nagahama (DPJ)	Junichi Ishii (LDP)	2007[14]
			2010[15]	Hiroyuki Konishi (DPJ)	Kuniko Inoguchi (LDP)	Kenichi Mizuno (Your Party)
Junichi Ishii (LDP)	Toshirō Toyoda (LDP)	Hiroyuki Nagahama (DPJ)	2013[16]
			2016[17]	Kuniko Inoguchi (LDP)	Taichirō Motoe (LDP)	Hiroyuki Konishi (DPJ)
	Hiroyuki Nagahama (CDP)	Toshirō Toyoda (LDP)	2019[18]
			2022[19]	Shoichi Usui (LDP)	Kuniko Inoguchi (LDP)	Hiroyuki Konishi (CDP)

1. Later joined Ryokufūkai^[9]
2. Later joined Kaishintō^[10]
3. Died in office 5 December 1953^[9]
4. Died in office 6 November 1950^[11]
5. Held 13 December 1950^[9]
6. Joined the Leftist Socialist Party then the Social Democratic Party during his first term
7. Held 20 January 1954^[9]
8. Resigned 27 October 1960^[9]
9. Died in office 18 September 1967^[9]
10. Held 1 December 1960^[9]
11. Died in office 25 January 1981^[9]
12. Held 5 November 1967^[9]
13. Resigned 8 May 2002^[9]
14. Held 8 March 1981^[9]
15. Joined the DPJ after the election
16. Held 27 October 2002^[12]

Election results

2025: Chiba at-large 3 seats^[20]

Party		Candidate	Votes	%	±%
	DPP	Sayaka Kobayashi	531,580	18.75	12.39
	CDP	Hiroyuki Nagahama	500,096	17.64	0.98
	LDP	Junichi Ishii	431,330	15.22	10.63
	Sanseitō	Megu Nakaya	405,400	14.30	10.91
	LDP	Toshirō Toyoda	277,723	9.80	13.33
	Reiwa	Natsumi Yamamoto	186,851	6.59	new
	JCP	Chiyo Shiraishi	135,751	4.79	2.86
	Ishin	Sadamichi Ishizuka	123,104	4.34	5.55
	Independent	Yūya Ōsuki	72,154	2.55	new
	Team Mirai	Shūhei Kobayashi	68,363	2.41	new
	Independent	Kyōko Ōtsuka	24,810	0.88	new
	Japan Reform Party	Naohisa Hashimoto	22,341	0.79	new
	Anti-NHK	Hiroshigi Tamamoto	21,569	0.76	0.35
	Independent	Tomaki Nakano	15,380	0.54	new
	Nihon Kaikaku	Yoshimasa Eda	9,476	0.33	new
	Japan Family Party	Hiroshi Ogasawara	8,652	0.31	new
Turnout				55.73	5.73
Registered electors			5,250,052
Party total seats			Won	Total	Change
	Liberal Democratic		1	3	1
	Constitutional Democratic		1	2
	Democratic Party For the People		1	1	1

2022^[19]

Party		Candidate	Votes	%
	LDP	Shoichi Usui (Endorsed by Komeito)	656,952	25.85
	LDP	Kuniko Inoguchi (Endorsed by Komeito)	587,809	23.13
	CDP	Hiroyuki Konishi (Endorsed by the SDP)	473,175	18.62
	Ishin	Masato Sano	251,416	9.89
	JCP	Kazuko Saito	194,475	7.65
	DPP	Hirokazu Isobe	161,648	6.36
	Sanseitō	Ryota Shiina	86,147	3.39
	Anti-NHK	Noriko Nakamura	28,295
	Happiness Realization	Hiroko Nanami	22,834	0.9
	Liberal Republican Party	Sakurako Uda	18,791	0.74
	New Party Kunimori	Mari Azusa	18,329	0.72
	Anti-NHK	Nobuhiro Watanabe	17,511	0.69
	Anti-NHK	Ryo Sudara	13,016	0.51
	Japan First	Megumi Kiuchi	10,922	0.43
Turnout			2,705,602	50.01
Total valid votes			2,607,139#	96.36
Rejected ballots			98,463	3.64
	LDP hold
	LDP hold
	CDP gain from Democratic

2019^[18]

Party		Candidate	Votes	%
	LDP	Kuniko Inoguchi (Endorsed by Komeito)	698,993	30.54
	CDP	Hiroyuki Nagahama (Endorsed by the DPP and the SDP)	661,224	28.89
	LDP	Toshiro Toyoda (Endorsed by Komeito)	436,182	19.06
	JCP	Fumiko Asano	359,854	15.72
	Anti-NHK	Masayuki Hiratsuka	89,941	3.93
	Euthanasia Party	Masanori Kadota	42,643	1.86
Turnout			2,374,919	45.28
Total valid votes			2,288,837	96.37
Rejected ballots			86,082	3.63
	LDP hold
	CDP gain from LDP
	LDP gain from Democratic

2016^[17]

Party		Candidate	Votes	%
	LDP	Kuniko Inoguchi	760,093	29.15
	LDP	Taichirō Motoe	577,392	22.15
	Democratic	Hiroyuki Konishi	472,219	18.11
	JCP	Fumiko Asano	359,854	15.72
	Democratic	Kenichi Mizuno	314,670	12.07
	Independent	Masao Takahashi	57,329	2.20
	Japanese Kokoro	Naritomo Katori	50,098	1.92
	Happiness Realization	Yuzo Furukawa	23,777	0.91
Registered electors			5,201,477
Turnout			2,705,602	52.02
Total valid votes			2,607,139	96.36
Rejected ballots			98,463	3.64
	LDP gain from Democratic
	LDP hold
	Democratic gain from Your

2013^[16]

Party		Candidate	Votes	%
	LDP	Junichi Ishii (endorsed by Komeito)	680,706	28.5
	LDP	Toshiro Toyoda (endorsed by Komeito)	418,806	17.5
	Democratic	Hiroyuki Nagahama	388,529	16.3
	Your	Masahiro Terada	285,007	11.9
	JCP	Satoshi Terao	232,477	9.7
	Restoration	Hiroki Hanazaki	186,259	7.8
	People's Life	Kazumi Ota	148,240	6.2
	Ishin Seito Shimpu	Yuichi Watanabe	39,147	1.6
	Happiness Realization	Hironori Matsushima	9,227	0.4
Turnout

2010^[15]

Party		Candidate	Votes	%
	Democratic	Hiroyuki Konishi (endorsed by People's New Party)	35,632	20.2
	LDP	Kuniko Inoguchi	513,772	19.3
	Your	Kenichi Mizuko	476,259	17.9
	Democratic	Ayumi Michi	463,648	17.4
	LDP	Kazuyasu Shiina	395,746	14.9
	JCP	Kazuko Saito	163,803	6.2
	New Renaissance	Hisashi Koga	66,384	2.5
	Sunrise	Satoshi Shimizu	29,926	1.1
	Happiness Realization	Masahiko Makino	12,669	0.5
Turnout

2007^[14]

Party		Candidate	Votes	%
	Democratic	Hiroyuki Nagahama	666,241	25.2
	LDP	Junichi Ishii (endorsed by Komeito)	541,701	20.5
	Democratic	Ken Kagaya	477,402	18.1
	LDP	Takaki Shirasuka (endorsed by Komeito)	387,395	14.7
	JCP	Fumiko Asano	214,991	8.1
	Independent	Susumu Honma	130,364	4.9
	Social Democratic	Kazumi Aoki	124,113	4.7
	People's New	Michiko Iwabuchi	99,316	3.8
Turnout

2004^[13]

Party		Candidate	Votes	%
	Democratic	Wakako Hironaka	1,187,663	49.1
	LDP	Kazuyasu Shiina (endorsed by Komeito)	944,231	39.0
	JCP	Fumiko Asano	288,072	11.9
Turnout

2002 By-Election^[12]

Party		Candidate	Votes	%
	LDP	Kazuyasu Shiina	509,688	45.1
	Clean Chiba Political Roundtable	Yasuhito Wakai	422,185	37.4
	JCP	Fumiko Asano	197,699	17.5
Turnout				39.61

See also

• List of districts of the House of Councillors of Japan