History
Kasumigaseki Station opened on 15 October 1958 with the Marunouchi Line, originally operated by the Teito Rapid Transit Authority (TRTA, also known as Eidan Subway). The Hibiya Line platforms opened on 25 March 1964, and the Chiyoda Line platforms on 20 March 1971. A large-scale rebuilding of the Marunouchi Line platforms began in November 1973 to handle rising passenger volumes, with the new outbound platform opening on 16 September 1976 and works completing in January 1978. The station was the target of the 20 March 1995 Tokyo subway sarin attack, during which it was forced out of service. On 1 April 2004 the station passed to Tokyo Metro on the privatisation of the Eidan. PASMO IC service began on 18 March 2007, and on 6 June 2020 the Hibiya Line TH Liner reserved-seat limited-express service started, with this station as an endpoint of the free-boarding section.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-24.
Notes
The platforms are arranged in a reversed U-shape, with the Marunouchi, Hibiya, and Chiyoda lines stacked counter-clockwise from the north; the Marunouchi and Chiyoda platforms are not directly connected, and the transfer between them runs through the Hibiya Line platform and takes about five minutes. A single-track connecting siding from the Chiyoda Line side runs to Sakuradamon on the Yūrakuchō Line, used mainly for stock movements but occasionally by special-charter trains. Every year on 20 March at 08:00, a silent tribute is held at the station to remember the assistant station master who died in the 1995 sarin attack.