[4] The station consists of two side platforms serving two tracks.

The station building is a small timber structure and is unstaffed, housing only a waiting room.

The two platforms are connected by a level crossing but there is a short flight of steps up from the access road and station forecourt to the station building.

With the privatization of Japanese National Railways (JNR), the successor of JGR, on 1 April 1987, control of the station passed to JR Kyushu.

[7] Media related to Iwamatsu Station at Wikimedia Commons