The underground station is built on three main levels, with the Tōzai Line platforms located on the 2nd basement level and the Shinjuku Line and Hanzōmon Line platforms on the 4th basement level.
Platforms
The Tōzai Line platforms consist of two side platforms running approximately north–south. The Shinjuku Line and Hanzōmon Line platforms on the 4th basement level were originally configured as two sets of side platforms running approximately east–west parallel to each other. From 16 March 2013, the separating wall between these platforms was removed, allowing cross-platform interchange between platform 4 (Hanzōmon Line Oshiage-bound) and platform 5 (Shinjuku Line Shinjuku-bound).[1]
The song "Under the Big Onion" (大きな玉ねぎの下で, Ookina Tamanegi no Shita de) by the band Bakufū Slump is used as the departure melody for the Tōzai Line platforms in 2015.[2]
Tozai Line platforms, 2018
Cross-platform interchange between the Hanzōmon Line and Shinjuku Line in February 2024
History
The station opened on 23 December 1964 as the eastern terminus of the Tozai Line from Takadanobaba.[3]
The Shinjuku Line platforms opened on 16 March 1980, and the Hanzomon Line platforms on 26 January 1989.[3]
The station facilities of the Hanzomon and Tozai Lines were inherited by Tokyo Metro after the privatization of the Teito Rapid Transit Authority (TRTA) in 2004.[4]
Work commenced on removing the separating wall between the parallel Tokyo Metro Hanzomon Line and Toei Shinjuku Line platforms (4 and 5) in 2012, allowing cross-platform interchange from 16 March 2013.[1]
^ ab平成25 年3 月16 日(土) 東京の地下鉄がさらに便利になります [Tokyo Subway to become even more convenient from 16 March 2013] (PDF). News release (in Japanese). Japan: Tokyo Metro & Toei Subway. 15 February 2013. Retrieved 16 February 2013.
^"2015年ニュースリリース|東京メトロ" [Departure melodies introduced to the Tozai Line!]. www.tokyometro.jp. 25 March 2015. Retrieved 12 June 2021.
^ abTerada, Hirokazu (July 2002). データブック日本の私鉄 [Databook: Japan's Private Railways]. Japan: Neko Publishing. pp. 213–215. ISBN4-87366-874-3.
^"「営団地下鉄」から「東京メトロ」へ" [From "Teito Rapid Transit Authority" to "Tokyo Metro"]. Tokyo Metro Online. 2006-07-08. Archived from the original on 16 May 2012. Retrieved 29 May 2022.