The station building is a wooden structure of traditional Japanese design and houses a staffed ticket window, a waiting area, a shop and a restaurant.

It staffs the ticket window which is equipped with a POS machine but does not have a Midori no Madoguchi facility.

On 2 December 1928, Miyaji was linked up with Tamarai, the western terminus of the Inukai Line (犬飼線), which had been extended westwards in phases from Ōita since 1914.

[6][7] Because of track damage from the 2016 Kumamoto earthquakes, service between Higo-Ōzu to Bungo-Ogi was suspended from April 2016.

JR Kyushu commenced the repair work, starting first with the track from Higo-Ōzu to Tateno.