Entry into politics and early career (1969–1986) In late 1968, JSP Chairman Tomomi Narita asked Doi to run in the Hyōgo 2nd district (multi-member). Initially reluctant, she was persuaded by persistent visits from local assemblyman Tokitarō Uotani. Her mentor Tanabatake had promised the party he would send a disciple if the opportunity arose, and Doi felt this was her turn. In January 1969, seeing a newspaper headline suggesting her candidacy while on a train, she protested to the paper and prepared to resign her personnel committee post. Kobe Deputy Mayor Tatsuo Miyazaki dismissed her intent, saying "No one thinks you'll actually run. You couldn't win anyway." Angered, Doi declared: "I've just decided that I will run," and submitted her resignation. The JSP nominated her alongside incumbent Masao Hori. In the
1969 Japanese general election, despite the party's worst result (90 seats), Doi narrowly won the last seat after a half-day seesaw battle with Democratic Socialist incumbent Eiji Yamashita, prevailing by about 1,400 votes. In the 1980s she focused on gender discrimination laws, questioning the government on issues like employment discrimination against women, mandatory home economics for girls only, and patrilineal nationality law. In 1983 she became JSP vice-chair after member Takahiro Yokomichi became Hokkaido governor.
Chairwoman of the Japan Socialist Party (1986–1991) After the 1986 double election defeat and Masashi Ishibashi's resignation, Doi became the 10th JSP chair—the first woman in party history and in constitutional-era Japan. Facing Prime Minister
Yasuhiro Nakasone (a constitutional revision advocate), she staunchly defended pacifism and disarmament. She helped block the sales tax bill via a four-party coalition (JSP-Kōmeitō-DSP-SDL), winning victories in by-elections and local polls that forced its withdrawal. She fiercely attacked the consumption tax introduction and Recruit scandal under Takeshita Noboru, forcing Finance Minister
Kiichi Miyazawa's resignation and toppling the cabinet. In the
1989 Japanese House of Councillors election, leveraging anti-consumption tax and Recruit sentiment via JSP-Kōmeitō-Rengō alliances, the JSP more than doubled seats, becoming the top party in the election and forcing the LDP into a minority in the chamber. This "Doi boom" (or "O-taka-san boom"; also "Madonna boom" for many new female winners) was driven by her plain-speaking appeal to housewives. She famously declared "The mountains have moved" (quoting
Akiko Yosano's feminist poem "The Day the Mountains Move"). The opposition-controlled House nominated her for prime minister (first woman so nominated), but the House of Representatives overruled it. She pushed a consumption tax repeal bill through the House (later blocked). In 1990 she aimed for 180 candidates but settled for 149 due to funding/multi-candidate resistance; the JSP gained 51 seats (best since 1967) but the LDP held a stable majority. Internal attacks on Doi (lacking union base) intensified after other opposition parties distanced themselves. The 1991 local elections saw major losses; she resigned citing responsibility.
Speaker of the House of Representatives (1993–1996) After the JSP's halving in the
1993 Japanese general election but her own re-election, the non-LDP/non-Communist coalition nominated her as Speaker—the first woman in either chamber. Tradition favored the largest party (now LDP opposition), leading to a rare contested vote; she won amid jeers from LDP members. She replaced "kun" with egalitarian "san" when addressing members (a one-off experiment) and criticized the Speaker's seat height as excessively elevated compared to foreign parliaments. In 1994 she mediated between Hosokawa and LDP's Kōno Yōhei to pass electoral reform after JSP rebels blocked it in the House of Councillors; critics called it a misstep favoring small-district emphasis. In 1995 she presided over the controversial 50th anniversary war resolution, passed amid mass walkouts and minimal attendance/quorum issues; opposition submitted no-confidence against her and Vice Speaker Kujiraoka (defeated). She left office upon 1996 dissolution.
Chairwoman of the Social Democratic Party (1996–2003) After the SDP's formation and mass defections to the new Democratic Party (excluding Doi/Murayama), she succeeded Murayama as chair. The party halved again in
1996 Japanese general election but she retained leadership. In 2002, after North Korea admitted abductions, Doi faced intense criticism for past denials (calling them "fabricated" in 1997), ignoring victim families' pleas, close Chongryon ties, and alleged insensitivity (e.g., telling families to "get over it"). In October she apologized, admitting insufficient pursuit and deception by North Korea. She was also linked to the 2002–2003 Tsujimoto Kiyomi secretary salary misuse scandal (involving her policy secretary Gotō Masako). In
2003 Japanese general election she lost her district (first time) but revived via PR; she resigned as chair amid party decline.
Later life and retirement (2005–2014) She ran unsuccessfully on PR in 2005, ending her Diet career. She continued pacifist advocacy, including a CM quipping "I won't let you change this snack. I won't let you change Article 9." ==Personal life==