The Niigata at-large district(Japanese: 新潟県選挙区, Hepburn: Niigata-ken senkyoku) is a constituency that represents Niigata Prefecture in the House of Councillors in the Diet of Japan. Since July 2019, it has two Councillors in the 242-member house, a decrease from its previous contingent of 3. Similar to other rural two seat districts in Northern Japan such as the Iwate at-large district, it often shows a willingness to buck the LDP and instead vote for opposition backed candidates, such as in 2019. Nonetheless, the LDP won the district by six points in the 2022 elections, and Uchikoshi only won by a margin of four points.

Outline

The constituency represents the entire population of Niigata Prefecture and has 1,925,565 registered voters as of September 2015. Since the first House of Councillors election in 1947 Niigata has elected four Councillors to six-year terms, two at alternating elections held every three years. The district's number of voters is the third-lowest of the 10 prefectures that are represented by four Councillors; by comparison, the Hokkaido, Hyogo at-large district and Fukuoka districts each have more than 4 million voters but are represented by the same number of Councillors as Niigata. To address this malapportionment in representation, a 2015 revision of the Public Officers Election Law decrease the representation of Niigata, Miyagi and Nagano districts to two Councillors while increasing Hyogo, Hokkaido and Fukuoka districts to six Councillors. This change took effect at the 2016 election, after which time, Niigata will elect only one Councillor during every election.

The Councillors currently representing Niigata are:

Elected Councillors

Class of 1947Election yearClass of 1950 (1947: 3-year term)
Bunkichi Tamura (Ind.)Kyōhei Shimojō (Social Democratic)1947Kazuo Kitamua (Liberal)Yoshio Fujita (Ind.)
1950Kazuo Kitamura (Liberal)Toshiei Kiyosawa (Social Democratic)
Bunkichi Tamura (Ryokufūkai)Yaheiji Saikawa (Liberal)1953
1955 by-electionMakie Koyanagi (LDP)
1956
Goro Takeuchi (Social Democratic)Yoshio Sato (LDP)1959
1962Zentaro Sugiyama (Social Democratic)
1965
Takashi Sato (LDP)1967 by-election
1968Jūichiro Tsukada (Ind.)Makoto Matsui (Social Democratic)
Zentaro Sugiyama (Social Democratic)1971
1972 by-electionTakeo Kimi (LDP)
1974Shiro Watari (LDP)Yutaka Shitoma (Social Democratic)
Jūichiro Tsukada (LDP)1976 by-election
1977 by-electionShin Hasegawa (LDP)
Masao Yoshida (Social Democratic)1977
1980
Toshio Inamura (Social Democratic)Yoshio Yoshikawa (LDP)1983
1986
1989 by-electionKinuko Ōfuchi (Social Democratic)
1989
1990 by-electionKazuo Majima (LDP)
1992
Michio Hasegawa (New Frontier)1995
1998Naoki Tanaka (LDP)
Yuko Mori (Liberal)Kazuo Majima (LDP)2001
Takahiro Kuroiwa (Ind.)2002 by-election
2004Masamichi Kondo (Ind.)
Yuko Mori (DPJ)Ichiro Tsukada (LDP)2007
2010Naoki Tanaka (DPJ)Yaichi Nakahara (LDP)
Naoki Kazama (DPJDPCDP)2013
2016Yuko Mori (Liberal)
Sakura Uchikoshi (CDP)2019
2022Kazuhiro Kobayashi (LDP)

Election results

2025
PartyCandidateVotes%±%
CDPSakura Uchikoshi (Incumbent)438,59240.2
LDPMai Nakamura428,16739.2
SanseitōEriko Hirai207,78619.0
Anti-NHKKininari Harada16,6041.5
Turnout61.67
2022
PartyCandidateVotes%±%
LDPKazuhiro Kobayashi517,58151.0
CDPYūko Mori (Incumbent)448,65144.2
SanseitōHiroki Endō32,5003.2
Anti-NHKHiroyuki Ochi17,0981.7
Turnout55.32
2019
PartyCandidateVotes%±%
CDPSakura Uchikoshi521,71750.49
LDPIchiro Tsukada (Incumbent)479,05046.36
Anti-NHKTadafumi Kojima32,6283.2
Turnout55.31
2016
PartyCandidateVotes%±%
IndependentYuko Mori560,42949.02
LDPYaichi Nakahara (Incumbent)558,15048.82
Happiness RealizationMotoyuki Yokoi24,6392.16
Turnout59.773.99
2013
PartyCandidateVotes%±%
LDPIchiro Tsukada (Incumbent) (endorsed by Komeito)456,54243.0
DemocraticNaoki Kazama204,83419.3
People's LifeYuko Mori (Incumbent)165,30815.6
RestorationRyūichi Yoneyama107,59110.1
JCPHiroshi Nishizawa60,3175.7
SocialDemocraticHideaki Watanabe46,1014.3
IndependentMiyoko Ankyu15,6121.5
Happiness RealizationHiroaki Ogose5,1880.5
Turnout
2010
PartyCandidateVotes%±%
DemocraticNaoki Tanaka (Incumbent)439,28937.9
LDPYaichi Nakahara412,21735.5
IndependentMasamichi Kondo (Incumbent) (Endorsed by People's New Party and Social Democratic Party)200,18217.2
JCPKatsutoshi Takeda73,5796.3
IndependentSatoshi Annaka24,3002.1
Happiness RealizationKenya Kasamaki10,9870.9
Turnout
2007
PartyCandidateVotes%±%
LDPIchiro Tsukada (endorsed by Komeito)403,49732.1
DemocraticYuko Mori (Incumbent) (endorsed by People's New Party)355,90128.3
DemocraticTakahiro Kuroiwa (Incumbent)344,42427.4
SocialDemocraticAkiko Yamamoto91,0167.2
JCPKatsutoshi Takeda54,5374.3
IndependentMitsumasa Kusuhara7,8060.6
Turnout
2004
PartyCandidateVotes%±%
IndependentMasamichi Kondo (endorsed by Democratic Party and Social Democratic Party)428,11734.9
LDPNaoki Tanaka (Incumbent) (endorsed by Komeito)367,05929.9
LDPIchiro Tsukada (endorsed by Komeito)319,96826.1
JCPKayoko Kuwahara111,2019.1
Turnout
April 2002 By-election
PartyCandidateVotes%±%
IndependentTakahiro Kuroiwa541,88153.3
LDPIchiro Tsukada342,20733.7
JCPKayoko Kuwahara132,67213.0
Turnout52.44%

See also