Tokyo 10th district is a constituency of the
House of Representatives in the
Diet of Japan (national legislature). As of 2012, 351,821 eligible voters were registered in the district.[1] It covers northwestern parts of the former
city of Tokyo. Originally it consisted of the ward of
Toshima and parts of
Nerima, but after redistricting in 2017 it comprises parts of four wards, Toshima, Nerima,
Nakano and
Shinjuku.
Before the electoral reform of 1994, the area had been part of
Tokyo 5th district where three Representatives had been elected by
single non-transferable vote. Until her successful gubernatorial bid in 2016, Liberal Democrat
Yuriko Koike had represented the district. Koike, formerly a representative for
Hyōgo 6th district, had taken over Tokyo 10th district in 2005 as one of Jun’ichirō Koizumi's "female assassins" to take out postal privatization rebel
Kōki Kobayashi. In the landslide election of 2009, she lost the district to Takako Ebata (
DPJ, Ozawa group), one of the so-called "Ozawa girls" (小沢ガールズ, Ozawa gāruzu), a group of female first-time candidates handpicked by DPJ ex-chairman
Ichirō Ozawa.