Following the resignation of Tokyo Governor
Naoki Inose in December 2013, Koike was widely rumored to be a potential candidate for the
gubernatorial election expected to be held in February 2014, along with
Hideo Higashikokubaru,
Hakubun Shimomura,
Seiko Hashimoto and
Yōichi Masuzoe. She ultimately did not run, and Masuzoe won. After Masuzoe announced his resignation in June 2016, Koike announced her intention to run in the
election for his successor. Koike stated that she would run "as an LDP lawmaker" but did not obtain the approval of the Tokyo LDP chapter before announcing her candidacy. The LDP officially endorsed
Hiroya Masuda, and its Tokyo chapter issued a notice that any members supporting Koike would be punished. Nonetheless, several prominent LDP politicians continued to back Koike, while senior leaders such as Shinzo Abe refrained from making speeches in support of either candidate. Koike was elected
Governor of Tokyo on 31 July 2016, becoming the first woman in the post. On 21 August 2016, at the
2016 Summer Olympics closing ceremony, Koike received the
Olympic Flag, via
Thomas Bach, from the mayor of Rio de Janeiro,
Eduardo Paes. On 31 May 2017, in advance of the upcoming local elections, Koike resigned from the
Liberal Democratic Party and officially became the leader of
Tomin First no Kai (Tokyoites First). Koike founded the group in 2016 in preparation for the elections and formed an alliance with
Komeito in an effort to secure a governing majority in Tokyo's parliament. On 3 July 2017, the alliance took a majority in the prefectural election, pushing out the Liberal Democratic Party with a combined 79 seats of the 127-seat assembly. Koike joined
Shinzo Abe's
cabinet, where the country led the government response to
COVID-19 pandemic in Japan, as well as the postponement of
2020 Tokyo Summer Olympics to 2021. She served as governor during the successful completion of the Olympics and Paralympics in 2021. She passed the Olympic flag to
Paris mayor
Anne Hidalgo during the closing ceremony, marking the conclusion of the games. It was largely held
behind closed doors with no public spectators permitted due to the declaration of a state of emergency in the
Greater Tokyo Area in response to the pandemic, the only Olympic Games to be held without official spectators. The Games were the most expensive ever, with total spending of over $20 billion. There have been 788 cases detected and reported by the Tokyo 2020 Organising Committee between 1 July and 8 September 2021, with 66 additional cases being detected among Games personnel before that date after the Committee started recording them at an unknown date. The cases have sparked concerns prior to the games. The bubble surrounding the Olympic Village has been described as having been broken after the first case occurred there in mid-July. On 14 August 2022, Governor of Jakarta
Anies Baswedan paid a working visit to Japan to meet with his counterpart from Tokyo, Yuriko Koike, to discuss the potential for cooperation in several fields, including for environment-friendly public transportation. Baswedan posted a picture of the meeting with Koike at the Tokyo City Hall accompanied by several delegates on his personal Instagram account. However, the governor did not furnish further details on the potential for cooperation between the two cities and the length of his stay in Japan. However, Baswedan did invite Koike to attend the Urban 20 forum as a
G20 side event in Jakarta at the end of August 2022. He later noted that
Tokyo and
Jakarta were sister cities, with longstanding relations. Hence, the meeting offered momentum to demonstrate commitment to intensifying relations between the two metropolitan cities. Koike announced on 29 August 2022 that Tokyo would begin implementation of the world's fastest mobile internet network. Leading the charge is Manabu Miyasaka, the newly appointed counselor to the governor on digital transformation of Tokyo and former chairman of Yahoo! Japan Corporation. Koike ran her platform based on seven zeros, which were basically socio-economic problems faced by residents of Tokyo. Out of these goals, she was able to reduce the number of children on waitlists to gain admission to daycares and cutting down the number of euthanized dogs and cats. However, critics say other goals like tackling the overwork culture, reducing crowding on rush hour trains, and getting rid of above-ground electricity poles have not yet been achieved. Koike and her preferred candidate,
Hirotada Ototake, placed fifth in the
Tokyo 15th district by-election of lower house. This has caused discussion to increase on if Koike is losing much of her reputation as an intensely popular governor. This also came ahead of the next
Tokyo gubernatorial election held in July 2024. The crushing loss Ototake faced was reported as potentially putting a damper on continuous rumors regarding her wish to return to national politics following her failure in the
2017 Japanese general election. However, exit polls projected after the 2024 Tokyo election that Koike would win a third term as governor. On August 6, 2024, Koike fractured her left knee while making a ceremonial first pitch at a
Central League baseball match at the
Meiji Jingu Stadium, forcing her to work remotely. == Political positions ==