Iwate 1st district(岩手[県第]1区, Iwate[-ken dai-]ikku) is a single-member constituency of the House of Representatives in the Diet of Japan. It is located in central Iwate and consists of the prefectural capital Morioka city and the two remaining towns in Shiwa district. Before 2017, it covered of the majority of the prefectural capital Morioka (the whole city without the former village of Tamayama) and Shiwa district. In 2012, 278,860 eligible voters were registered in the district.

Before the electoral reform of 1994, the area had been part of the multi-member Iwate 1st district that elected four Representatives by single non-transferable vote.

Iwate is the home of Ichirō Ozawa and like three of the prefecture's four post-reform districts, the 1st district had been represented by his parties from its creation to 2012: the New Frontier Party, the Liberal Party and the Democratic Party. In 2012, Ozawa and his followers split from the Democratic Party: 1st district representative Shina stayed with the Democrats, Ozawa's Tomorrow Party of Japan nominated Yōko Tasso, the wife of former representative and current Iwate governor Takuya Tasso; but Shina defended the district against Tasso and Liberal Democratic former prefectural assembly member Hinako Takahashi who won a proportional block seat.

List of representatives

RepresentativePartyDatesNotes
Takuya TassoNFP1996–2000
LP2000–2003
DPJ2003–2007Resigned. Elected Governor of Iwate Prefecture in 2007
Takeshi ShinaDPJ2007–2016
DP2016–2017
Kibō no Tō2017–2018
DPP2018–2020
CDP2020–2026
CRA2026–

Election results

2026
PartyCandidateVotes%±%
Centrist ReformTakeshi Shina73,20944.217.3
LDPHiromasa Yonai (Won a seat in the PR Block67,81140.912.5
SanseitōTaisei Sasaki12,2337.4
JCPKyōko Yoshida10,4486.33.7
IndependentYūji Ogasawara2,0801.3
Registered electors285,158
Turnout165,78158.694.32
Centrist Reform hold
2024
PartyCandidateVotes%±%
CDPTakeshi Shina94,40961.510.3
LDPHiromasa Yonai43,62328.48.4
JCPKyōko Yoshida15,36710.01.9
Registered electors287,457
Turnout54.374.44
CDP hold
2021
PartyCandidateVotes%±%
CDPTakeshi Shina87,01751.21.4
LDPHinako Takahashi62,66636.92.4
JCPKyōko Yoshida20,30011.91.0
Registered electors293,290
Turnout58.811.79
CDP hold
2017
PartyCandidateVotes%±%
Kibō no TōTakeshi Shina87,53452.6
LDPHinako Takahashi (elected in Tohoku PR block)57,38134.53.1
JCPKyōko Yoshida21,54912.92.5
Registered electors296,551
Turnout57.023.52
2014
PartyCandidateVotes%±%
DemocraticTakeshi Shina (DC)76,78752.0+17.3
LDPHinako Takahashi (DC, won PR seat)46,40931.4+4.1
JCPKyōko Yoshida15,37410.4new
Social DemocraticMitsumasa Hosokawa (DC, $)9,0526.1new
2012
PartyCandidateVotes%±%
DemocraticTakeshi Shina (endorsed by PNP, DC)55,90934.7
LDPHinako Takahashi (DC, elected by PR)44,00227.3
TomorrowYōko Tasso (endorsed by NPD, DC)41,70625.9
Social DemocraticMasahiro Isawa (DC, $)9,9226.2
JCPShino Yahata ($)9,4735.9
2009
PartyCandidateVotes%±%
DemocraticTakeshi Shina (endorsed by PNP)116,42560.2
LDPHinako Takahashi (endorsed by Komeito)50,58526.2
Social DemocraticMasahiro Isawa13,0486.8
JCPKyōko Yoshida12,1876.3
Happiness RealizationKensaku Mori1,0470.5
Turnout195,47470.93
By-election, July 29, 2007
PartyCandidateVotes%±%
DemocraticTakeshi Shina (endorsed by PNP)102,98761.7
LDPMasanori Tamazawa (endorsed by Komeito)53,12531.8
JCPSadakiyo Segawa10,8216.5
Turnout169,09261.05
2005
PartyCandidateVotes%±%
DemocraticTakuya Tasso95,10951.7
LDPAtsushi Oikawa65,18735.4
Social DemocraticMitsumasa Hosokawa14,0507.6
JCPShin'ya Kanbe9,6595.2
Turnout185,84567.93
2003
PartyCandidateVotes%±%
DemocraticTakuya Tasso91,02553.6
LDPAtsushi Oikawa57,89934.1
Social DemocraticYuriko Gotō12,0147.1
JCPYōichi Naganuma8,8065.2
Turnout171,88063.34
2000
PartyCandidateVotes%±%
LiberalTakuya Tasso97,83543.0
LDPTokuichirō Tamazawa65,59737.7
Social DemocraticYuriko Gotō17,3099.9
JCPRyūgorō Satō9,2615.3
DemocraticKikuji Fujikura6,9644.0
1996
PartyCandidateVotes%±%
New FrontierTakuya Tasso67,42040.6
LDPTokuichirō Tamazawa (elected by PR)49,66529.9
IndependentRiki Nakamura17,08710.3
Social DemocraticKuniki Yamanaka16,75810.1
JCPToshiko Sakuma10,6686.4
DemocraticYuriko Gotō4,5512.7
Turnout168,43465.63