The opened the line from 1916 to 1917. The railway was acquired by the in 1923 and nationalised in 1943 together with other Bantan Railway lines, i.e. the
Kakogawa Line, the
Takasago Line, the
Kajiya Line and the
Hōjō Line. Freight services ceased in 1974. Miki Railway, a
third sector company, took over the line from
Japanese National Railways in 1985. The majority of commuters used
Kobe Electric Railway's (Shintetsu)
Ao Line to get to
Kobe instead of the Miki–Kakogawa Line route. As a result, Miki Railway had been unable to justify continued financial support from the city. On March 1, 2007, the Miki City Council officially decided to abandon the line with the company agreeing on April 26, 2007. The line was closed on April 1, 2008. This was the fourth third-sector railway operator to cease operations, and the fifth third-sector line closed. ==Stations==