Prefectural elections for the Tokyo Metropolitan Assembly (平成29年/2017年東京都議会議員選挙, Heisei 29-nen/2017-nen Tōkyō togikai giin senkyo, "Heisei 29/2017 election of members of the Tokyo Metropolitan Assembly") were held on 2 July 2017. The 127 members were elected in forty-two electoral districts, seven returning single members elected by first-past-the-post, and thirty-five returning multiple members under single non-transferable vote. Four districts had their magnitude adjusted in this election to match population changes.

Quick Facts All 127 seats in the Tokyo Metropolitan Assembly 64 seats needed for a majority, Turnout ...

2017 Tokyo prefectural election

← 2013 2 July 2017 2021 →
All 127 seats in the Tokyo Metropolitan Assembly 64 seats needed for a majority
Turnout	51.28%(7.78%)[1]
First party Second party Third party   Leader Yuriko Koike Hakubun Shimomura Yōsuke Takagi Party Tomin First Liberal Democratic Komeito Leader since 31 May 2017 Last election New 59 23 Seats won 49 23 23 Seat change 49 36 0 Popular vote 1,884,029 1,260,101 734,697 Percentage 33.68% 22.53% 13.13% Swing New 13.51% 0.97%   Fourth party Fifth party Sixth party   共産 ネット Leader Yoshiharu Wakabayashi Jin Matsubara Mitsuko Nishizaki Party Communist Democratic Tokyo Seikatsusha Network Last election 17 15 3 Seats won 19 5 1 Seat change 2 10 2 Popular vote 773,722 385,752 69,929 Percentage 13.83% 6.90% 1.25% Swing 0.22% 8.34% 0.83%   Seventh party   維新 Leader Takeshi Fujimaki Party Innovation Last election New Seats won 1 Seat change 1 Popular vote 54,016 Percentage 0.97% Swing New
Assembly President before election Shigeo Kawai Liberal Democratic Elected Assembly President Daisuke Ozaki Tomin First

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The results of the election persuaded Shinzo Abe to call a snap election, and led to the resignation of Renho as Democratic Party leader.

LDP leader Shinzo Abe took office as Prime Minister following the 2012 general election and strengthened his position in the 2014 general election. However, Abe's government was subsequently struck by criticism for its handling of the Moritomo Gakuen scandal and controversial remarks by Defense Minister Tomomi Inada.^[2] In the meantime, Yuriko Koike won the 2016 Tokyo gubernatorial election as an independent candidate, and left the LDP in June 2017 to found a new local political party, Tomin First, to challenge the LDP in the prefectural election.^[3] At the time of the election, Koike was widely believed to be eyeing a future bid to replace Abe as prime minister.^[2][3]

With counting almost complete, the seat distribution was as follows:^[6][7][8]

• Supporters of Yuriko Koike won 79 seats in total: 49 by Tomin First no Kai, 23 by Kōmeitō, 1 by the Seikatsusha Net, and 6 by independents endorsed by Tomin;
• The LDP, previously the largest party, fell to 23 seats, their worst-ever result (their worst scores had previously been 38 seats, in the 1965 and 2009 elections);
• The Communist Party won 19 seats, improving further on their strong 2013 result;
• The DP was reduced to five seats and the single Ishin no Kai incumbent defended his seat.

Months after the Tokyo prefectural election, Abe called a snap general election for October 2017, and Koike established the new Kibo no To party to challenge the LDP nationally.

On the same day, the mayoral election in Kokubunji, Tokyo returned incumbent Kunio Izawa, backed by LDP and Komeito, against center-left supported (DP, JCP, LP, SDP, Net) former deputy mayor Michio Higuchi.^[9][10][11] Another prefectural election on July 2 was the gubernatorial election in Hyōgo.^[12]