The station building is a modern functional concrete structure which houses a waiting area, automatic ticket vending machines, a SUGOCA card reader and a staffed ticket window.

Kajiki, with the other stations on the older route then became part of the Hisatsu Line on 17 October 1927.

By the end of 1932, further expansion and link ups with other networks to the east of Kokubu resulted in another line providing through-traffic to the north of Kyushu, from Kokura to Kagoshima.

The entire stretch of track down the east coast of Kyushu from Kokura through Kajiki to Kagoshima then redesignated as the Nippō Main Line on 6 December 1932.

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