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Electoral district in Japan

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Chiba 5th District
千葉県第4区
Parliamentary constituency for the Japanese House of Representatives

Prefecture	Chiba
Proportional District	Southern Kanto
Electorate	413,484 (as of September 2022)
Current constituency
Created	1994
Seats	One
Party	CDP
Representative	Kentarō Yazaki

Chiba 5th District (千葉県第5区, Chiba-ken dai-go-ku) is an electoral district in the Japanese House of Representatives. The district was established in 1994 after the introduction of single-member constituencies in that year. Since its creation it has been redistricted twice: once in 2002 and again in 2022.

Arfiya Eri, a Liberal Democratic Party politician of Uyghur won a by-election on 17 April 2023.

Areas covered

Current district

Areas covered 2002–2022

Ichikawa
- Part of the central government office district
  - Ichikawa 1 – Ichikawa 3, Ichikawaminami, Mama 1-3, Shinden, Hirata, Yawata, Minami-yawata, Sugano, Higashi-Kanno, Higashihama 1, Tajiri, Takaya, Takaya Shinmachi, Baraki, Futamta, Futamata Shinmachi, Kamimyouden
Urayasu

Areas covered before 2002

From its establishment in 1994 until its first redistricting in 2002, the areas covered by the district were as follows:

Ichikawa (just the districts of Gyotoku and the Ichikawa Government district)
Urayasu

List of representatives

Election	Representative		Notes
1996	Kou Tanaka [ja]	Democratic	Elected mayor of Ichikawa City in 2022
2000	Kou Tanaka [ja]	Democratic	Elected mayor of Ichikawa City in 2022
2003	Hirotami Murakoshi [ja]	Democratic
2005	Kentaro Sonoura	Liberal Democratic
2009	Hirotami Murakoshi [ja]	Democratic	Mayor of Ichikawa City in 2018 – 2022
2012	Kentaro Sonoura	Liberal Democratic	Resigned on 21 December 2022
2014
2017
2021
Vacant (December 2022–April 2023)
2023 by-el	Arfiya Eri	Liberal Democratic
2024	Kentarō Yazaki	CDP

Election results

‡ - Also ran in the South Kanto PR block election

2024
Party		Candidate	Votes	%	±%
	CDP	Kentarō Yazaki	66,031	30.60	3.01
	LDP	Arfiya Eri (elected in PR block)	59,636	27.63	2.85
	DPP	Junko Okano (elected in PR block)	51,033	23.65	8.63
	Ishin	Tomoyasu Kishino	17,615	8.16	5.72
	JCP	Masato Sakurai	11,015	5.10	2.37
	Sanseitō	Jun'ichi Myaji	10,490	4.86	New
Registered electors			414,963
Turnout				53.21	14.96
	CDP gain from LDP

2023
Party		Candidate	Votes	%	±%
	LDP	Arfiya Eri	50,578	30.58	16.39
	CDP	Kentarō Yazaki	45,635.399	27.59	1.72
	DPP	Junko Okano	24,842	15.02	4.83
	Ishin	Tomoyasu Kishino	22,952	13.88	0.36
	JCP	Kazuko Saitō	12,360	7.47	6.78
	Independent	Kentaro Hoshi	6,561.599	3.97	New
	Seijika Joshi	Mitsue Oda	2,463	1.49	New
Registered electors			451,273
Turnout				38.25	15.82
	LDP hold

2021
Party		Candidate	Votes	%	±%
	LDP	Kentaro Sonoura	111,985.611	46.97	4.05
	CDP	Kentaro Yazaki	69,887.387	29.31	New
	Ishin	Tamotsu Shīki	32,241	13.52	New
	DPP	Atsushi Tokita	24,307	10.19	New
Registered electors			450,365
Turnout				54.07	4.96
	LDP hold

2017
Party		Candidate	Votes	%	±%
	LDP	Kentaro Sonoura	107,299	51.02	2.78
	CDP	Atsushi Yamada	62,894	29.91	New
	Kibō no Tō	Junko Okano	40,115	19.07	New
Registered electors			438,691
Turnout				49.11	0.09
	LDP hold

2014
Party		Candidate	Votes	%	±%
	LDP	Kentaro Sonoura	105,941	53.80	18.49
	Democratic	Hirotami Murakoshi	57,500	29.20	7.09
	JCP	Fumiko Asano	28,055	14.25	8.82
	Independent Politician	Kazuo Ishida	5,411	2.75	New
Registered electors			415,510
Turnout				49.20	8.66
	LDP hold

References

"総務省｜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] (in Japanese). Retrieved 2023-01-04.
Johnston, Eric (2023-04-24). "Kishida rules out snap poll after LDP wins big in Sunday by-elections". The Japan Times. Retrieved 2023-04-24.
"2024年衆議院議員総選挙千葉5区". NHK (in Japanese). Retrieved January 8, 2025.
"千葉5区 - 第49回衆議院議員補欠選挙" [Chiba 5th District - by-election of 49th House of Representatives general election]. go2senkyo.com (in Japanese). Retrieved 2023-06-22.
"千葉5区 - 第49回衆議院議員選挙" [Chiba 5th District - 49th House of Representatives general election]. go2senkyo.com (in Japanese).
"千葉5区 - 第48回衆議院議員選挙" [Chiba 5th District - 48th House of Representatives general election]. go2senkyo.com (in Japanese).
"千葉5区 - 第47回衆議院議員選挙" [Chiba 5th District - 47th House of Representatives general election]. go2senkyo.com (in Japanese).

v t e First-past-the-post (FPTP) districts and proportional representation (PR) "blocks" for the Japanese House of Representatives of the National 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
Eliminated districts	Eliminiated in 2002 Hokkaido 13 Yamagata 4 Shizuoka 9 Shimane 3 Oita 4 Eliminiated in 2013 Fukui 3 Yamanashi 3 Tokushima 3 Kochi 3 Saga 3 Eliminiated in 2017 Aomori 4 Iwate 4 Mie 5 Nara 4 Kumamoto 5 Kagoshima 5 Eliminiated 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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