The track was extended westwards in phases, with Tamarai being established as its western terminus on 30 November 1925.

This track was also extended in phases, reaching Miyaji as its eastern terminus on 25 January 1918.

On 2 December 1928, Miyaji and Tamarai were linked up, with Namino opening on the same day as one of several intermediate stations along the new track.

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

[8] Media related to Namino Station at Wikimedia Commons This Kumamoto Prefecture railroad station-related article is a stub.