Iwamoto

Known weekday departures: 15/day · Known Sat & holiday departures: 15/day

First / last known departure (weekday): 7:03 / 23:48

Busiest hour (known departures): 7:00–8:00 (2)

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 3 May 2026 (retrieved in spring/summer 2026).

• Joetsu Line: Numata ⇄ Tsukuda (Gunma)

Iwamoto Station opened on 31 March 1924 as a stop on Japanese National Railways' Jōetsu Line, in what is now the city of Numata, Gunma. Freight handling ended on 15 December 1962 and parcel service on 1 February 1984, and the station was destaffed on 10 August 1985, after which station duties continued to be carried out by special ticket inspection. It passed to JR East at the 1 April 1987 privatisation and was made unstaffed again on 1 May 2004. Suica acceptance began on 14 March 2009 when the Tokyo Suburban Area was expanded to include the station, and the current station building opened on 13 March 2010, replacing the old wooden building that had been used in a 1982 Glico Cecil Chocolate commercial.

The old wooden station building at Iwamoto, replaced by the present building in 2010, appeared in a 1982 Glico Cecil Chocolate television commercial, renamed "Misato Station" for the spot.