Kazusa-Ichinomiya

Known weekday departures: 39/day in the available timetable data · Known Sat & holiday departures: 37/day in the available timetable data

Earliest / latest departure in the available data (weekday): 6:03 / 22:07

Busiest hour in the available data: 6:00–7:00 (5)

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 2 May 2026 (retrieved in spring/summer 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 incomplete:

• JR Sotobo Line: only trains from timetables filed under other lines

• JR Sotobo Line: Yatsumi ⇄ Ohara (Chiba)

Kazusa-Ichinomiya Station opened on 17 April 1897 as Ichinomiya Station with the Bōsō Railway's extension from Ōami, handling both passengers and freight. The line was extended onward to Ōhara on 13 December 1899, and the Bōsō Railway was nationalised on 1 September 1907, making this a station of the Imperial Railway Agency. On 1 January 1916 it was renamed Kazusa-Ichinomiya as part of a co-ordinated nationwide effort to remove duplicate "Ichinomiya" station names: the same day, the three other Ichinomiya stations were renamed Mikawa-Ichinomiya, Owari-Ichinomiya and Nagato-Ichinomiya (now Shin-Shimonoseki). Freight handling ended on 1 July 1971, parcel handling on 1 February 1984, and the station passed to JR East on 1 April 1987. Suica acceptance began on 16 October 2004 when the station was added to the Greater Tōkyō area, and a dedicated east IC-only gate opened on 1 July 2020 ahead of the 2020 Tōkyō Olympics surfing competition at the nearby Tsurigasaki beach. The Midori-no-Madoguchi ticket office closed on 31 July 2022.

During the Pacific War a spur line ran from Kazusa-Ichinomiya Station to a balloon-bomb (fūsen bakudan) base.