Ōita at-large district

Ōita at-large district
大分県選挙区
Parliamentary constituency for the House of Councillors
Prefecture	Ōita
Electorate	950,450 (as of September 2022)[1]
Current constituency
Created	1947
Seats	2
Councillors	Class of 2019:   Aki Shirasaka[a] (LDP) Class of 2022:   Harutomo Koshō (LDP)

Ōita at-large district is a constituency in the House of Councillors of Japan, the upper house of the Diet of Japan (national legislature). It currently elects 2 members to the House of Councillors, 1 per election. It is unique among other Kyushu conservative kingdoms for its willingness to elect opposition members. Shinya Adachi held the districts 2022 seat from 2004, and Kiyoshi Adachi held the 2016 seat until his resignation in 2023, with Tadatomo Yoshida losing the by-election after by an extremely slim margin. This is possibly due to the presence of the city of Ōita, which has shown a willingness to support opposition candidates; it was historically also represented by a second Japan Socialist Party Councilor.

Elected members of House of Councillors

Class of (1947/1953/...)	Election	Class of (1950/1956/...)
#1 1947: #1, 6 Year Term		#1 1947: #2, 3 Year Term
Jinzo Iwao (NCP)	1947	Masaji Hitotsumatsu (LP)
	1950	Masaji Hitotsumatsu (Yoshida LP)
Fumio Gotō (Indep.)	1953
	1956	Yoshitaka Goto (LDP)
Haruzo Murakami (LDP)	1959
	1962	Yoshitaka Goto (LDP)
Haruzo Murakami (LDP)	1965
	1968	Yoshitaka Goto (LDP)
Ryohei Kudo (JSP)	1971
	1974	Hidekazu Iwao † 1976 (LDP)
	1976 by-election	Masao Goto (OFF)
Seishirō Etō (ATSNS)	1977
	1980	Masao Goto (LDP)
Keigi Kajiwara (JSP)	1983
	1986	Masao Goto (LDP)
Keigi Kajiwara (JSP)	1989
	1992	Ban Kugimiya (LDP)
Keigi Kajiwara (JSP)	1995
	1998	Toshiya Nakamichi (LDP)
Hiroko Goto (LDP)	2001
	2004	Shinya Adachi (DPJ)
Yōsuke Isozaki (LDP)	2007
	2010	Shinya Adachi (DPJ)
Yōsuke Isozaki (LDP)	2013
	2016	Shinya Adachi (DP)
Kiyoshi Adachi (Indep.)	2019
	2022	Harutomo Kosho (LDP)
Aki Shirasaka (LDP)	2023 by-election

OFF - Oita Farrmers Federation ASTNS - Association To Send a New Style to National Politics †: Died in Office

Election results

2023 by-election[2]

Party		Candidate	Votes	%	±%
	LDP	Aki Shirasaka [ja]	196,122	50.04	3.46
	CDP	Tadatomo Yoshida	195,781	49.96	New
Registered electors			943,477
Turnout				42.48	10.50

2022[3]

Party		Candidate	Votes	%	±%
	LDP	Harutomo Kosho [ja]	228,417	46.58	0.52
	DPP	Shinya Adachi (Incumbent)	183,258	37.37	New
	JCP	Kai Yamashita	35,705	7.28	3.73
	Sanseitō	Yūko Shigematsu	21,723	4.43	New
	Anti-NHK	Taizo Ninomiya	10,770	2.20	2.19
	Independent	Yūichi Kotegawa	10,512	2.14	New
Registered electors			950,511
Turnout				52.98	2.44

2019[4]

Party		Candidate	Votes	%	±%
	Independent	Kiyoshi Adachi	236,153	49.55	New
	LDP	Yōsuke Isozaki (Incumbent)	219,498	46.06	1.88
	Anti-NHK	Taizo Ninomiya	20,909	4.39	New
Registered electors			969,453
Turnout				50.54	7.84

2016[5]

Party		Candidate	Votes	%	±%
	DP	Shinya Adachi (Incumbent)	271,783	48.13	New
	LDP	Harutomo Kosho	270,693	47.94	2.04
	HRP	Atsuko Ueda	22,153	3.92	1.08
Registered electors			989,634
Turnout				58.38	5.23

2013[6]

Party		Candidate	Votes	%	±%
	LDP	Yōsuke Isozaki (Incumbent)	250,915	49.98	7.41
	Independent	Shintaro Goto	137,049	27.30	New
	JCP	Kai Yamashita	55,249	11.01	2.26
	YP	Hideki Urano	44,542	8.87	New
	HRP	Atsuko Ueda	14,265	2.84	New
Registered electors			981,222
Turnout				53.15	9.81

2010[7]

Party		Candidate	Votes	%	±%
	DPJ	Shinya Adachi (Incumbent)	294,286	48.68	6.14
	LDP	Kiyoshi Odawara [ja]	257,322	42.57	9.93
	JCP	Kai Yamashita	52,863	8.75	2.57
Registered electors			990,648
Turnout				62.96	5.23

Notes

1. Shirasaka was elected in a by-election in 2023, following Kiyoshi Adachi resigning to run for Governor of Ōita Prefecture.

References

1. "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.
2. "参議院議員補欠選挙 大分県選挙区". NHK (in Japanese). Retrieved 2023-10-31.
3. "第26回参議院議員通常選挙 大分県選挙区". NHK (in Japanese). Retrieved 2023-10-31.
4. "第25回参議院議員通常選挙 大分県選挙区". NHK (in Japanese). Retrieved 2023-10-31.
5. "第24回参議院議員通常選挙 大分県選挙区". NHK (in Japanese). Retrieved 2023-10-31.
6. "第23回参議院議員通常選挙 大分県選挙区". NHK (in Japanese). Retrieved 2023-10-31.
7. "第22回参議院議員通常選挙 大分県選挙区". NHK (in Japanese). Retrieved 2023-10-31.