History
Nakano-sakaue Station opened on 8 February 1961 with the Teito Rapid Transit Authority's Ogikubo Line section from Shinjuku to Shin-Nakano and the simultaneously inaugurated branch from Nakano-sakaue to Nakano-Fujimichō, making the station the junction of the Marunouchi Line and its Hōnanchō branch. The Ogikubo Line was renamed the Marunouchi Line on 1 April 1972. The Toei Subway Line 12 platform — today's Ōedo Line — opened on 19 December 1997, with the 2000 line renaming completing today's name pair. Tokyo Metro inherited the Marunouchi platforms at the 2004 TRTA privatisation. A new Honchō exit and ticket-gate opened on 11 August 2012.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-18.
Notes
The Toei Ōedo Line platform 33.4 m below street level sits in a five-tier structure shared with the Shuto Expressway Central Circular Yamate Tunnel: tunnel ventilation occupies the intermediate B2 mezzanine, the expressway itself takes B2, and the Ōedo Line ventilation and tracks occupy B3 and B4 — the expressway slips between the Marunouchi tracks 2 m above and the Ōedo tracks 5 m below.