History
Sasazuka Station opened on 15 April 1913 as a terminus on the new Keiō Electric Tramway between Sasazuka and Chōfu, with a depot adjacent to the platforms. Extensions in October 1913 turned it into a through stop, and wartime consolidation routed the station through Tokyu (the "Greater Tokyu" merger of 1944) and into the spun-off Keio Teito Electric Railway in June 1948. Elevation of the tracks was completed on 21 July 1978, followed on 31 October 1978 by the underground Keio New Line, which terminates here and continues to the Toei Shinjuku Line. Platform-edge doors entered service in February 2023 and February 2024.
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
Sasazuka functions simultaneously as a through stop on the Keio Line and as the de-facto terminus of the Toei Shinjuku Line, since New-Line trains turn back here using an extended siding.