Nakai

Weekday departures: 420/day in the available timetable data · Sat & holiday departures: 361/day in the available timetable data

Earliest / latest departure in the available data (weekday): 5:10 / 24:31 (00:31 next day)

Busiest hour in the available data: 8:00–9:00 (37)

0:00 ─ 23:00

Figures are typical departures in the timetable data, not a live service count.

Timetable data as of 28 April 2026.

The timetable data is incomplete for some or all lines at this station, so the weekday and Sat & holiday figures are departures in the available timetable data, not totals.

Lines where the timetable data is complete: Oedo Line

Lines where the timetable data is incomplete:

• Seibu Shinjuku Line: no timetable data

• Oedo Line: Ochiai-minami-nagasaki ⇄ Higashi-Nakano

The Seibu side of Nakai Station opened on 16 April 1927. A 1 November 1963 rebuild turned the original island platform into two side platforms flanking a central passing track, enabling express overtaking. A footbridge entered service on 16 November 1969, and automatic fare gates on 1 December 1992. On 19 December 1997 the Toei side opened as a stop on the Number 12 Line — renamed the Ōedo Line on 20 April 2000 — about 35 metres below Yamate-dōri. PASMO acceptance began on 18 March 2007. On 5 June 2016 the Seibu ticket hall moved underground, and a north–south free passage with a new north entrance opened on 17 December 2016. Numbers SS04 (Seibu) and E 32 (Toei) apply.

The Toei platform sits roughly 35 metres below ground beneath both Yamate-dōri and the Shuto Expressway Central Circular Route's Yamate Tunnel, with no direct underground passage to the ground-level Seibu station above.