Sanseitō
Updated: 12/11/2025, 9:15:36 AM Wikipedia source
Sanseitō (Japanese: 参政党, lit. 'Political Participation Party'; self-rendered as Party of Do It Yourself in English, DIY) is an ultraconservative, right-wing populist political party in Japan. It is on the far-right of the political spectrum. The party was founded in 2020 by Sohei Kamiya, the current secretary general of the party, and won a seat in the 2022 House of Councillors election, also becoming an official political party by winning more than 2% of the vote in the election. Sanseitō gained international media attention during the 2022 House of Councillors election due to Kamiya's antisemitic rhetoric during public appearances and campaign rallies. In the 2024 general election, the party won 3 seats. In the 2025 House of Councillors election, the party won more than 14 seats, bringing its total seat number to 15. According to the party's leader Kamiya, it is the Japanese equivalent of Trumpism in the United States. The party promotes COVID-19 misinformation. The party's president, Manabu Matsuda, has called COVID-19 vaccines a "murder weapon". The party is against same-sex marriage and LGBT rights. The party strongly opposes immigration, claiming that foreigners bring crime and receive better treatment than native citizens. It proposes the creation of a new constitution to replace the existing one and published a draft that contains minimal human rights protections.
Infobox
Abbreviation
DIY
Leader
Sohei Kamiya
Founded
17 March 2020; 5 years ago (2020-03-17)
Headquarters
Azabudai Hills, Minato, Tokyo 106-0041, Japan
Newspaper
Sanseitō DIY Times
Ideology
mw- Japanese nationalismUltraconservatismRight-wing populismAnti-immigration
Political position
Far-right
Slogan
投票したい政党がないから、自分たちでゼロからつくるTōhyō shitai seitō ga naikara, jibuntachide zero kara tsukuru('Since there is no political party to vote for, we will create our own from scratch!')
Councillors
15 / 248
Representatives
3 / 465
Prefectural assembly members
18 / 2,644
Municipal assembly members
138 / 29,135
Tables
· Election results › House of Representatives
Votes
Votes
Election
Votes
Leader
%
Constituency
Seats
Constituency
+/-
Constituency
Votes
Constituency
%
Party list
Seats
Party list
+/-
Party list
Seats
Party list
+/-
2024
2024
Election
2024
Leader
Sohei Kamiya
Constituency
1,357,189
Constituency
2.50%
Constituency
0 / 289
Constituency
New
Party list
1,870,347
Party list
3.43%
Party list
3 / 176
Party list
New
Total
3 / 465
Total
New
Position
8th
Status
Opposition
| Election | Leader | Constituency | Party list | Total | Position | Status | |||||||
| Votes | % | Seats | +/- | Votes | % | Seats | +/- | Seats | +/- | ||||
| 2024 | Sohei Kamiya | 1,357,189 | 2.50% | 0 / 289 | New | 1,870,347 | 3.43% | 3 / 176 | New | 3 / 465 | New | 8th | Opposition |
· Election results › House of Councillors
Votes
Votes
Election
Votes
Leader
%
Constituency
Seats
Constituency
Votes
Constituency
%
Party list
Seats
Party list
Election
Party list
+/-
Seats
Total
Seats
+/-
2022
2022
Election
2022
Leader
Sohei Kamiya
Constituency
2,018,215
Constituency
3.80
Constituency
0 / 75
Party list
1,768,385
Party list
3.33
Party list
1 / 50
Seats
1 / 125
Seats
New
Seats
1 / 248
Seats
New
Position
8th
Status
Opposition
2025
2025
Election
2025
Leader
9,264,284
Constituency
15.66
Constituency
7 / 75
Constituency
7,425,054
Party list
12.55
Party list
7 / 50
Party list
14 / 125
Seats
14
Seats
15 / 248
Seats
14
Seats
6th
Position
Opposition
| Election | Leader | Constituency | Party list | Seats | Position | Status | |||||||
| Votes | % | Seats | Votes | % | Seats | Election | +/- | Total | +/- | ||||
| 2022 | Sohei Kamiya | 2,018,215 | 3.80 | 0 / 75 | 1,768,385 | 3.33 | 1 / 50 | 1 / 125 | New | 1 / 248 | New | 8th | Opposition |
| 2025 | 9,264,284 | 15.66 | 7 / 75 | 7,425,054 | 12.55 | 7 / 50 | 14 / 125 | 14 | 15 / 248 | 14 | 6th | Opposition | |
· Election results › By-elections
2024
2024
Election
2024
Leader
Sohei Kamiya
Constituency
Tokyo 15th
Candidate
Rina Yoshikawa
Votes
8,639
%
5.1
Position
6th
Status
Lost
| Election | Leader | Constituency | Candidate | Votes | % | Position | Status |
| 2024 | Sohei Kamiya | Tokyo 15th | Rina Yoshikawa | 8,639 | 5.1 | 6th | Lost |
· Leadership
Sohei Kamiya
Sohei Kamiya
Position
Leader
Name
Sohei Kamiya
Rina Yoshikawa
Rina Yoshikawa
Position
Board Members
Name
Rina Yoshikawa
| Position | Name |
| Leader | Sohei Kamiya |
| Board Members | Rina Yoshikawa |
| Hiroshi Ando | |
| Mizuho Umemura | |
| Mayuko Toyota |
· Leadership › Diet Members' group
Sohei Kamiya
Sohei Kamiya
Position
Leader
Name
Sohei Kamiya
Hiroshi Ando
Hiroshi Ando
Position
Secretary GeneralChairman of the Policy Research Council
Name
Hiroshi Ando
| Position | Name |
| Leader | Sohei Kamiya |
| Secretary GeneralChairman of the Policy Research Council | Hiroshi Ando |
| Chairman in the House of Councillors | Manabu Matsuda |
| Chairman of the Diet Affairs Committeein the House of Representatives | Atsushi Suzuki |
| Chairman of the Diet Affairs Committeein the House of Councillors | Mizuho Umemura |
References
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- ラサール石井https://www.nikkan-gendai.com/articles/view/news/373863
- "「NISAの資産を使い国産SNSを開発」 参政党の神谷議員の国会質問が話題に 発言の真意は？"https://www.itmedia.co.jp/news/articles/2303/17/news189.html
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