Aki-Nagatsuka Station features two narrow side platforms serving two tracks. The station initially had one island platform, but a new side platform serving Aki-Kameyama bound trains was opened on November 28, 2015. After the opening of the new side platform, the old island platform was converted to serve only Hiroshima bound trains, and was fenced off from the Aki-Kameyama bound track. The station building is located north-west of the platforms, and is shaped like an octagon. A railway crossing connects the Hiroshima bound platform to the station building. The station is manned and features automated ticket machines as well.