Constitutional Democratic Party of Japan
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Constitutional Democratic Party of Japan
Constitutional Democratic Party of Japan
Rikken-minshut? or Ritsumint?
LeaderYukio Edano
Deputy LeaderAkira Nagatsuma
Secretary-GeneralTetsur? Fukuyama
Councillors LeaderHiroyuki Nagahama
15 September 2020; 10 months ago (2020-09-15)[a]
Dissolved14 September 2020[a]
Merger ofDemocratic Party for the People (majority faction)
Constitutional Democratic Party of Japan[a]
Split fromDemocratic Party (2016)[a]
Headquarters2-12-4 Fuji Building 3F, Hirakawa-ch?,
Chiyoda-ku, Tokyo 102-0093, Japan
Political positionCentre-left[6][8]
International affiliationCouncil of Asian Liberals and Democrats (observer)[9]
Colors  Blue[10]
("Politics for you")
Local (Prefectural and Local) assembly members

The Constitutional Democratic Party of Japan (, Rikken-minshut?); CDP), sometimes abbreviated to Minshut? (),[12] is a centre-left political party in Japan.[13] The party was founded in October 2017 as a split from the Democratic Party ahead of the 2017 general election. In September 2020, the party dissolved and was refounded as a merger with the Democratic Party for the People and some independent lawmakers.[14] The party is led by Yukio Edano.


CDP headquarters in Hirakawa-ch?, Tokyo.
Party logo, 2017-2020

Formation and 2017 election

The party was formed from a centre-left split from the opposition Democratic Party (DP) in the run up to the 2017 general election.[15][13][16] Prior to the election on 28 September 2017, the DP House of Representatives caucus dissolved in order for party members to stand as candidates for Tokyo governor Yuriko Koike's Party of Hope or as independents in the upcoming election.[17]

The new party was launched on 2 October by DP deputy leader Yukio Edano at a press conference in Tokyo for liberals and left-leaning members of the DP who do not wish to, or were rejected for, contesting the election as candidates for the Party of Hope.[18][19]

On 3 October 2017, it was announced that the new party would not contest seats where former Democrats were running as Party of Hope candidates,[20] a gesture which was not returned when the Party of Hope ran a candidate in Edano's incumbent district. The Japanese Communist Party, in turn, pulled their own candidate from running in Edano's district so as to not take away votes from him.[21] The party won a total of 55 seats,[13] becoming the leading opposition party and leading the pacifist bloc (including the JCP and Social Democratic Party) to become the largest opposition bloc.

2020 merger

On 19 August 2020, the CDP announced that it would merge with the majority of the Democratic Party for the People (DPP) as well as some independent Diet members in September of that year.[22]

On 10 September 2020, the new party elected Edano as leader and also voted to retain the CDP name.[8] Following the merger, the new CDP had a total of 149 members and held 107 seats in the House of Representatives, compared to 156 members and 96 seats held by the Democratic Party in 2016. The independents who joined the CDP in this merger included former Prime Minister Yoshihiko Noda. Several conservative DPP members, including DPP president Yuichiro Tamaki, did not join the CDP and instead formed their own party.[14]

On 14 November 2020, the Social Democratic Party (SDP) voted to agree to a merger arrangement with the CDP, allowing SDP members to leave the party and join the CDP. However, SDP leader Mizuho Fukushima was opposed to the merger agreement and as a result remains in the Social Democratic Party.[23]


The party opposes the proposed revision of Article 9 of Japan's postwar constitution.[13][24][25] The party supports the phasing out of nuclear energy in Japan,[26] and government investment in renewable energy.[27] The party does not support the legalization and maintenance of casinos.[28] The party also supports "building a society that supports each other and makes full use of individuality and creativity."[29][30] and this party expresses its support for grassroots democracy and diplomatic pacifism.[31]

The party supported a freeze in the increase of the consumption tax as of 2017,[32][33] and supports a temporary consumption tax cut as of 2020, along with higher taxes on corporations and wealthy individuals.[14]


Position Name
Leader Yukio Edano
Deputy leader
Policy Affairs Research Council chief
Akira Nagatsuma
Vice leader
Election Campaign Committee chief
Sh?ichi Kond?
Vice leader
General Affairs Committee chief
Takahiro Sasaki
Vice leader
Councillors caucus chief secretary
Renh? Sait?
Councillors caucus leader
Tetsur? Fukuyama
Deputy Secretary-General Yukihiko Akutsu
Policy Affairs Research Council deputy chief Seiji ?saka
Chinami Nishimura
Policy Affairs Research Council first vice chief Y?ichir? Aoyagi
Diet Affairs Committee chief Kiyomi Tsujimoto
Diet Affairs Committee deputy chief K?ichi Yamauchi
Diet Affairs Committee first vice chief Yoshio Tezuka
Councillors Affairs Committee chief Masayoshi Nataniya
Board of Governors chief Hiroshi Kawauchi
Joint House General Council chief Satoshi Arai
Parliamentary Association chief Katsuhiko Yokomitsu


No. Name
Constituency / title Term of office Election results Image (term)
Took Office Left Office
Split from: Democratic Party (2016) (centre-left)
Merger of: Democratic Party for the People (centre-right; majority faction)
1 Yukio Edano
(b. 1964)
Rep for Saitama 5th 2 October 2017 Incumbent
Yukio Edano - 107
Kenta Izumi - 42
Yukio Edano In front of Tenjin Twin Building (2020.10.18).jpg Abe S.

Election results

House of Representatives election results

Election Leader Candidates Seats won Constituency votes Constituency vote percentage PR Block votes PR Block vote percentage Status
2017 Yukio Edano 78
4,852,097 8.75% 11,084,890 19.88% Opposition

House of Councillors election results

Election Leader Seats Nationwide Prefecture Status
Total Won Votes % Votes %
2019 Yukio Edano
7,951,430 15.79 7,917,720 15.81 Opposition


  1. ^ a b c d The "old CDP" was founded on 3 October 2017[1] as a split from the Democratic Party and dissolved on 14 September 2020,[2] while the current party was founded on 15 September 2020[3] as a merger of the old CDP, the majority of the Democratic Party for the People and some independent lawmakers.
  2. ^ Held after the merger with the Democratic Party for the People.


  1. ^ "" (PDF). Ministry of Internal Affairs and Communications (in Japanese). 2017-10-03.
  2. ^ "" (PDF). Ministry of Internal Affairs and Communications (in Japanese). 2020-09-14.
  3. ^ "" (PDF). Ministry of Internal Affairs and Communications (in Japanese). 2020-09-15.
  4. ^ ? [Information of the newspaper "Rikken-minshu"]. (in Japanese). Retrieved 2019.
  5. ^ "Japan opposition parties' failing merger bid offers glimpse into divisions". The Japan Times. 17 January 2020.
  6. ^ a b Spremberg, Felix (25 November 2020). "How Japan's Left is repeating its unfortunate history". International Politics & Society Journal. Retrieved 2021. The new party programme is still decidedly left-liberal
  7. ^ "Edano to form Constitutional Democratic Party". NHK World. NHK. 2 October 2017. Archived from the original on 25 October 2017. Retrieved 2017.
  8. ^ a b Johnston, Eric (2020-09-10). "Yukio Edano elected chief of new CDP, Japan's top opposition party". The Japan Times. Retrieved .
  9. ^ "Japan's Main Opposition Party Joins CALD as Observer". July 3, 2020. Retrieved 2020.
  10. ^ [Will the colors of political parties settle in Japan?] (in Japanese). Nikkei, Inc. 21 October 2017. Retrieved 2019. [Constitutional Democratic Party is blue.]
  11. ^ (in Japanese) Retrieved 2020. Missing or empty |title= (help)
  12. ^ (Minshut?) was the original name of the Democratic Party. The CDP has reused that for their official abbreviated name.
  13. ^ a b c d William D. Hoover, ed. (2018). Historical Dictionary of Postwar Japan. Rowman & Littlefield. p. 61. ISBN 978-1-5381-1156-7.
  14. ^ a b c Kuronuma, Susumu (2020-09-11). "Japan's fractured opposition unites as party of 140-plus lawmakers". Nikkei Asian Review. Retrieved .
  15. ^ "New centre-left party launched in Japan ahead of vote". Channel News Asia. 2 October 2017. Retrieved 2017.
  16. ^ "2017 Lower House Election / Edano announces launch of new party of liberals". The Yomiuri Shimbun. Archived from the original on 2017-10-02. Retrieved .
  17. ^ Yoshida, Reiji (28 September 2017). "Democratic Party effectively disbands, throwing support behind Koike's party for Lower House poll" – via Japan Times Online.
  18. ^ "Major opposition's liberal wing to form new group". Kyodo News. 2 October 2017. Retrieved 2017.
  19. ^ "VOTE 2017: Edano plans to form new party as liberal force in election:The Asahi Shimbun".
  20. ^ "Koike's party unveils 1st list of 192 candidates for upcoming election". Japan Today. 4 October 2017. Retrieved 2017.
  21. ^ "Yukio Edano: Japan's opposition leader to watch". Nikkei Asian Review. October 22, 2017. Retrieved 2017.
  22. ^ "Japan's largest opposition parties to merge in September". The Asahi Shimbun. 2020-08-20. Retrieved .
  23. ^ "Social Democratic Party to split; most Diet members to join CDPJ". The Japan Times. 25 February 2018. Retrieved 2020.
  24. ^ Yoshida, Reiji (16 October 2017). "Edano taking center stage as CDP gains momentum" – via Japan Times Online.
  25. ^ Sieg, Linda (17 October 2017). "Underdog centre-left party may outperform expectations in Japan snap poll". Reuters.
  26. ^ "2017 Lower House Election / Parties debate whether, when to bring N-plants back online". The Yomiuri Shimbun. 17 October 2017. Archived from the original on 21 October 2017. Retrieved 2017.
  27. ^ "It's not enough for political parties to merely tout economic catchwords". The Yomiuri Shimbun. 18 October 2017. Archived from the original on 19 October 2017. Retrieved 2017.
  28. ^ Archived copy ?, 2017-12-28, archived from the original on 2018-02-15, retrieved CS1 maint: archived copy as title (link)
  29. ^ ? (2017-10-07), @?, retrieved
  30. ^ "CDF Pamphlet" (PDF). Archived from the original (PDF) on 2017-10-08. Retrieved . Cite journal requires |journal= (help)
  31. ^ (PDF). 2017. Archived from the original (PDF) on 10 October 2017.
  32. ^ "Edano's new party may outperform expectations in Sunday's election". Japan Today. 18 October 2017. Retrieved 2017.
  33. ^ "2017 Lower House Election / Voters not impressed". The Economist. 19 October 2017. Retrieved 2017.

See also

External links

  • Official website Edit this at Wikidata
  • {{Twitter}} template missing ID and not present in Wikidata.(in Japanese)
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