Iwamatsu

Known weekday departures: 36/day · Known Sat & holiday departures: 36/day

First / last known departure (weekday): 5:40 / 23:05

Busiest hour (known departures): 6:00–7:00 (3)

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).

• JR Omura Line: Omura (Nagasaki) ⇄ Isahaya

Iwamatsu opened on 20 April 1945 as an additional intermediate stop on the existing Ōmura Line, built by the Ministry of Transport during the final months of the Pacific War. Parcels handling and full staffing were withdrawn on 20 October 1971, leaving the station under simple delegated management. With the privatisation of Japanese National Railways on 1 April 1987, operation passed to JR Kyushu. The station was rebuilt during the JR era from a single-side-platform configuration to two opposing side platforms linked by a level crossing, allowing trains to pass and supporting an increased Ōmura Line timetable. SUGOCA IC card service began on 1 December 2012.

On 10 March 2021 JR Kyushu disclosed that the station's automatic ticket machine had displayed the wrong fare to Nishiurakami for ten years - 760 yen instead of the correct 660 yen - though the overhead route-map fare table had remained accurate the entire time.