|Minister of Land, Infrastructure, Transport and Tourism|
17 September 2010 – 14 January 2011
|Prime Minister||Naoto Kan|
|Preceded by||Seiji Maehara|
|Succeeded by||Akihiro Ohata|
|Member of the House of Representatives|
|Assumed office |
5 February 2019
|Preceded by||Shinji Tarutoko|
9 November 2003 – 28 September 2017
|Preceded by||Masahiro Morioka|
|Succeeded by||Shigeki Kobayashi|
|Born||23 August 1960|
|Alma mater||Yokohama National University|
Until 2000, Mabuchi worked in private sector and became director of the firm he was working for at age 32. He was elected to the House of Representatives for the first time in 2003 after an unsuccessful run in 2000. He was appointed senior vice minister of land, infrastructure, transport and tourism in September 2009.
On 17 September 2010, Mabuchi was named as the new minister of land, infrastructure, transport and tourism in the reshuffled Naoto Kan cabinet. Mabuchi left prime minister Kan's cabinet on 14 January 2011, after the then-opposition Liberal Democratic Party (LDP) passed a censure motion against him following the leaking of Japanese Coast Guard footage of the 2010 Senkaku boat collision incident. and ran unsuccessfully to replace him in the DPJ presidential election after Kan stepped down, losing to Yoshihiko Noda, who replaced Kan as Prime Minister. After the Democratic Party of Japan suffered a major defeat to the LDP under Noda at 2012 Japanese general election. Noda resigned to accept responsibility for the defeat.
Mabuchi continued to hold his seat until he was narrowly defeated in the 2017 general election. He had the highest ratio of margin of defeat (sekihairitsu) (97.27%) among all defeated candidates in the election. Mabuchi returned to the House in February 2019 after the resignation of Shinji Tarutoko, who was contesting the Osaka 12th district by-election. Being the candidate with the next largest sekihairitsu in Kibō no Tō's 2017 Kinki proportional representation list, Mabuchi was next in line to fill Tarutoko's PR seat. Mabuchi chose to sit as an independent.
Media related to Sumio Mabuchi at Wikimedia Commons