Ookayama

Known weekday departures: 533/day · Known Sat & holiday departures: 429/day

First / last known departure (weekday): 5:17 / 24:18 (00:18 next day)

Busiest hour (known departures): 8:00–9:00 (51)

0:00 ─ 23:00

Figures are the departures known from the timetable data, not a count of today's actual service.

Timetable data as of 13 May 2026 (retrieved in spring/summer 2026).

• Tokyu Oimachi Line: Midorigaoka (Tokyo) ⇄ Kita-senzoku
• Tokyu-Meguro Line: Senzoku ⇄ Okusawa

Ōokayama Station opened on 11 March 1923 as a stop on the Meguro-Kamata Electric Railway, predecessor of today's Tokyu Meguro Line, on the border of Ōta and Meguro wards in Tokyo. The Ōimachi Line platforms were added on 6 July 1927. An ambitious rebuild began on 16 October 1990 and progressively moved both lines underground between 1996 and June 1997, eliminating several level crossings and replacing the surface station — three platforms and four tracks beneath an overhead station building — with an underground two-island, four-track facility entered from a ground-level building. The reconfigured station, with platforms arranged by direction of travel, opened on 27 June 1997, and on 6 August 2000 the Mekama Line was split into the Meguro Line and Tokyu-Tamagawa Line, leaving Ōokayama as a junction of the Meguro and Ōimachi lines. On 3 November 2007 the relocated Tokyu Hospital opened directly above the station — reportedly the first Japanese instance of a hospital sited on top of a working railway station.

A plan to move the Tokyu Hospital from a site about five minutes away to a position directly above the station dates from the 1990s undergrounding works, and coil springs were installed beneath the rails during that work to damp vibration from passing trains. The hospital opened above the station on 3 November 2007, reportedly the first case in Japan of a hospital placed directly over a working railway station.