History
Kotake-mukaihara Station opened on 24 June 1983 — under the provisional name Mukaihara — when the Teito Rapid Transit Authority's Yūrakuchō Line was extended between Eidan Narimasu and Ikebukuro. The Seibu Yūrakuchō Line began service to the station on 1 October 1983, opening through running with the Yūrakuchō Line. Eidan's New Yūrakuchō Line (today's Fukutoshin Line) reached the station on 7 December 1994, the Seibu Yūrakuchō Line was double-tracked on 26 March 1998, and TRTA was privatised into Tokyo Metro on 1 April 2004. Platform-edge doors and the present Yūrakuchō / Fukutoshin shared operation entered service on 14 June 2008, and a directional link to the Wakōshi side was completed on 14 February 2016 to reduce crossing-movement delays.
History summarized from Japanese & English Wikipedia · last reviewed 2026-06-09.
Where the English and Japanese sources differ, this account follows the Japanese source.
Notes
Kotake-mukaihara is split between two operators by physical ownership as well as service — Seibu owns the Nerima-side half of the inner two tracks while Tokyo Metro owns the Ikebukuro half of those tracks plus all of the outer two, with construction costs originally apportioned along the same one-quarter / three-quarters split.