The Miki Electric Railway Co. opened the Suzurandai – Hirono Golf-jo-mae on 28 December 1936.[1] DMUs operated until the section was electrified the following year and extended to Miki Uenomaru, with the extension to Miki opening in 1938.
In 1947 the company merged with the Kobe Electric Railway Co., which extended the line to Ono on 28 December 1951, and from Ono to Ao on 10 April 1952.[1]
The Nishi-Suzurandai – Aina section was duplicated in 1982, and the Kizu – Oshibedani section was duplicated between 1979 and 1989.
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