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Constitutional Democratic Party of Japan

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Constitutional Democratic Party of Japan

The Constitutional Democratic Party of Japan (立憲民主党, Rikken-minshutō; CDP or CDPJ) is a liberal political party in Japan. It is the primary centre-left party in Japan, and is the second largest party in the National Diet behind the ruling Liberal Democratic Party (LDP). It was founded in October 2017 as a split from the Democratic Party ahead of the 2017 general election. In late 2020, the party was re-founded following a merger with majorities of the Democratic Party For the People and the Social Democratic Party as well as some independent lawmakers. The party's platform supports raising the minimum wage, expanded welfare policies, the legalization of same-sex marriage, increased gender equality, renewable energy policies, decentralization, a multilateral and pragmatic foreign policy, the revision of the U.S.–Japan Status of Forces Agreement, tax reform and electoral reform. The party strongly opposes efforts to amend the Japanese Constitution to reinterpret Article 9 or codify the status of the Japan Self-Defense Forces and also opposes nuclear power.

Infobox

Abbreviation
CDPCDPJ
President
Yoshihiko Noda
Executive Deputy President
Shoichi KondoSumio MabuchiHarumi Yoshida
Secretary-General
Jun Azumi
Founder
Yukio Edano
Founded
3 October 2017; 8 years ago (2017-10-03)15 September 2020; 5 years ago (2020-09-15)[a]
Split from
Democratic Party (2016)[a]
Preceded by
Constitutional Democratic Party of Japan[a]
Headquarters
2-12-4 Fuji Building 3F, Hirakawa-chō,Chiyoda-ku, Tokyo 102-0093, Japan
Newspaper
Rikken-minshu
Youth wing
RikkenYouth
Membership (August 2024)
114,839
Ideology
mw- Liberalism (Japanese)Social liberalism
Political position
Centre to centre-left
International affiliation
Council of Asian Liberals and Democrats (observer)
Colors
mw- Blue
Slogan
政権交代こそ、最大の政治改革。Seiken koutai koso, saidaino seijikaikaku.('A change of government is the biggest political reform.')
Councillors
38 / 248
Representatives
148 / 465
Prefectural assembly members
238 / 2,644
Municipal assembly members
712 / 29,135

Tables

· Leadership
Yoshihiko Noda
Yoshihiko Noda
Position
President
Name
Yoshihiko Noda
House
Representatives
Shoichi Kondo
Shoichi Kondo
Position
Executive Deputy President
Name
Shoichi Kondo
House
Representatives
Sumio Mabuchi
Sumio Mabuchi
Position
Deputy President
Name
Sumio Mabuchi
House
Representatives
Representatives
Representatives
Position
Harumi Yoshida
Name
Representatives
Jun Azumi
Jun Azumi
Position
Secretary-General
Name
Jun Azumi
House
Representatives
Makiko Kikuta
Makiko Kikuta
Position
Chairman of the Standing Committee
Name
Makiko Kikuta
House
Representatives
Seiji Osaka
Seiji Osaka
Position
Chairman of the Election Campaign Committee
Name
Seiji Osaka
House
Representatives
Satoshi Honjō
Satoshi Honjō
Position
Chairman of the Policy Reseach Council
Name
Satoshi Honjō
House
Representatives
Hirofumi Ryu
Hirofumi Ryu
Position
Chairman of the Diet Affairs Committee
Name
Hirofumi Ryu
House
Representatives
Chinami Nishimura
Chinami Nishimura
Position
Executive Deputy Secretary-General
Name
Chinami Nishimura
House
Representatives
Katsuhito Nakajima
Katsuhito Nakajima
Position
Director of the Executive Office
Name
Katsuhito Nakajima
House
Representatives
Position
Name
House
President
Yoshihiko Noda
Representatives
Executive Deputy President
Shoichi Kondo
Representatives
Deputy President
Sumio Mabuchi
Representatives
Harumi Yoshida
Representatives
Secretary-General
Jun Azumi
Representatives
Chairman of the Standing Committee
Makiko Kikuta
Representatives
Chairman of the House of Councillors Caucus
Shunichi Mizuoka
Councillors
Chairman of the Election Campaign Committee
Seiji Osaka
Representatives
Chairman of the Policy Reseach Council
Satoshi Honjō
Representatives
Chairman of the Diet Affairs Committee
Hirofumi Ryu
Representatives
Executive Deputy Secretary-General
Chinami Nishimura
Representatives
Secretary-General in the House of Councillors
Masayo Tanabu
Councillors
Director of the Executive Office
Katsuhito Nakajima
Representatives
· Leadership › List of the Leaders
Split from: Democratic Party (2016) (centre-left)
Split from: Democratic Party (2016) (centre-left)
No.
Split from: Democratic Party (2016) (centre-left)
1
1
No.
1
Leader(birth–death)
Yukio Edano(b. 1964)
Leader(birth–death)
Constituency
Rep for Saitama 5th
Took office
3 October 2017
Left office
14 September 2020
Election results
2017 Unopposed
Merger of: Democratic Party For the People (centre-right; majority faction) & Some Independents Group
Merger of: Democratic Party For the People (centre-right; majority faction) & Some Independents Group
No.
Merger of: Democratic Party For the People (centre-right; majority faction) & Some Independents Group
1
1
No.
1
Leader(birth–death)
Yukio Edano(b. 1964)
Leader(birth–death)
Constituency
Rep for Saitama 5th
Took office
15 September 2020
Left office
12 November 2021
Election results
2020 Yukio Edano – 107Kenta Izumi – 42
2
2
No.
2
Leader(birth–death)
Kenta Izumi(b. 1974)
Leader(birth–death)
Constituency
Rep for Kyoto 3rd
Took office
30 November 2021
Left office
23 September 2024
Election results
2021 1st Round Kenta Izumi – 189Seiji Osaka – 148Junya Ogawa – 133Chinami Nishimura – 1022021 2nd Round Kenta Izumi – 205Seiji Osaka – 128
3
3
No.
3
Leader(birth–death)
Yoshihiko Noda(b. 1957)
Leader(birth–death)
Constituency
Rep for Chiba 4th
Took office
23 September 2024
Left office
Incumbent
Election results
2024 1st Round Yoshihiko Noda – 267Yukio Edano – 206Kenta Izumi – 143Harumi Yoshida – 1222024 2nd Round Yoshihiko Noda – 232Yukio Edano – 180
No.
Leader(birth–death)
Constituency
Took office
Left office
Election results
Split from: Democratic Party (2016) (centre-left)
1
Yukio Edano(b. 1964)
Rep for Saitama 5th
3 October 2017
14 September 2020
2017 Unopposed
Merger of: Democratic Party For the People (centre-right; majority faction) & Some Independents Group
1
Yukio Edano(b. 1964)
Rep for Saitama 5th
15 September 2020
12 November 2021
2020 Yukio Edano – 107Kenta Izumi – 42
2
Kenta Izumi(b. 1974)
Rep for Kyoto 3rd
30 November 2021
23 September 2024
2021 1st Round Kenta Izumi – 189Seiji Osaka – 148Junya Ogawa – 133Chinami Nishimura – 1022021 2nd Round Kenta Izumi – 205Seiji Osaka – 128
3
Yoshihiko Noda(b. 1957)
Rep for Chiba 4th
23 September 2024
Incumbent
2024 1st Round Yoshihiko Noda – 267Yukio Edano – 206Kenta Izumi – 143Harumi Yoshida – 1222024 2nd Round Yoshihiko Noda – 232Yukio Edano – 180
House of Representatives · Election results › House of Representatives
No.
No.
Election
No.
Leader
±
No. ofcandidates
Share
Seats
No.
Seats
Share
Seats
No.
Position
Share
2017
2017
Election
2017
Leader
Yukio Edano
No. ofcandidates
78
Seats
55 / 465
Seats
11.8%
Position
2nd
Constituency votes
4,852,097
Constituency votes
8.75%
PR Block votes
11,084,890
PR Block votes
19.88%
Status
Opposition
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
Election
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
2021
2021
Election
2021
Leader
Yukio Edano
No. ofcandidates
240
Seats
96 / 465
Seats
20.6%
Position
2nd
Constituency votes
17,215,621
Constituency votes
29.96%
PR Block votes
11,492,095
PR Block votes
20.00%
Status
Opposition
2024
2024
Election
2024
Leader
Yoshihiko Noda
No. ofcandidates
237
Seats
148 / 465
Seats
52
Seats
31.8%
Position
2nd
Constituency votes
15,740,860
Constituency votes
29.01%
PR Block votes
11,564,217
PR Block votes
21.20%
Status
Opposition
Election
Leader
No. ofcandidates
Seats
Position
Constituency votes
PR Block votes
Status
No.
±
Share
No.
Share
No.
Share
2017
Yukio Edano
78
55 / 465
11.8%
2nd
4,852,097
8.75%
11,084,890
19.88%
Opposition
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
2021
Yukio Edano
240
96 / 465
20.6%
2nd
17,215,621
29.96%
11,492,095
20.00%
Opposition
2024
Yoshihiko Noda
237
148 / 465
52
31.8%
2nd
15,740,860
29.01%
11,564,217
21.20%
Opposition
House of Councillors · Election results › House of Councillors
Won
Won
Election
Won
Leader
±
No. ofcandidates
Total
Seats
±
Seats
No.
Seats
Share
Seats
No.
Position
Share
2019
2019
Election
2019
Leader
Yukio Edano
No. ofcandidates
42
Seats
17 / 124
Seats
32 / 245
Position
2nd
Constituency votes
7,951,430
Constituency votes
15.79%
Party list votes
7,917,720
Party list votes
15.81%
Status
Opposition
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
Election
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
2022
2022
Election
2022
Leader
Kenta Izumi
No. ofcandidates
51
Seats
17 / 125
Seats
39 / 248
Position
2nd
Constituency votes
8,154,330
Constituency votes
15.33%
Party list votes
6,771,914
Party list votes
12.77%
Status
Opposition
2025
2025
Election
2025
Leader
Yoshihiko Noda
No. ofcandidates
51
Seats
22 / 125
Seats
5
Seats
38 / 248
Seats
1
Position
2nd
Constituency votes
9,119,656
Constituency votes
15.42%
Party list votes
7,397,456
Party list votes
12.50%
Status
Opposition
Election
Leader
No. ofcandidates
Seats
Position
Constituency votes
Party list votes
Status
Won
±
Total
±
No.
Share
No.
Share
2019
Yukio Edano
42
17 / 124
32 / 245
2nd
7,951,430
15.79%
7,917,720
15.81%
Opposition
Merger of: Democratic Party For the People (centre-right; majority faction) & some Independents (2020)
2022
Kenta Izumi
51
17 / 125
39 / 248
2nd
8,154,330
15.33%
6,771,914
12.77%
Opposition
2025
Yoshihiko Noda
51
22 / 125
5
38 / 248
1
2nd
9,119,656
15.42%
7,397,456
12.50%
Opposition

References

  1. The "old CDP" was founded on 3 October 2017 as a split from the Democratic Party and dissolved on 14 September 2020, whi
  2. Most conservative factions within the CDP are moderate conservatives, but some CDP members belong to ultra-conservative
  3. Held after the merger with the Democratic Party For the People.
  4. The Upper house is split in two classes, one elected every three years.
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