Shōwajima Station is served by the 17.8 km Tokyo Monorail Haneda Airport Line from Monorail Hamamatsuchō in central Tokyo to Haneda Airport Terminal 2, and lies 9.9 km from the northern terminus of the line at Monorail Hamamatsuchō.

The platforms are connected by underpass with entrances and ticket barriers on the east and west sides of the station.

[2] Local trains normally use platforms 1 and 4 to allow non-stop Haneda Express services to pass.

The station opened as an unmanned station on 7 February 1985 beside Shōwajima Depot, initially for use by depot staff and workers in nearby factories around the area.

[1] In fiscal 2011, the station was used by an average of 4,411 passengers daily.