Tōkyō 25th district is a constituency of the
House of Representatives in the
Diet of Japan. It is located in the westernmost part of
Tokyo prefecture. In of 2012, 321,319 eligible voters were registered in the district giving it the highest vote weight in Tokyo – several districts in former Tokyo city in Eastern Tokyo have more than 450,000 voters – but still more than 1.5 times as many voters as the least populated electoral districts in Japan.[2]
Since its creation, Tokyo 25th district has been a relatively safe seat for the
Liberal Democratic Party and withstood the landslide Democratic victory in the 2009 general election. Its first representative, former defence minister
Yōzō Ishikawa (Miyazawa→Kōno faction (present-day Asō faction)) who had represented the pre-reform 11th district since 1976, was succeeded by
Shinji Inoue (Asō faction), a former
MLIT bureaucrat.