The Inbi Line was built by the Japanese Government Railway, with the first section opened from Tottori to Mochigase in 1919, extended to Chizu in 1923. The Tsuyama to Mimasaka-Kamo section, opened in 1928, was extended to Mimasaka-Kawai in 1931 and the line was completed with the opening of the section to Chizu (including a 3,077 m tunnel) in 1932.
CTC signalling was commissioned between Tottori and Chizu in 1994.[citation needed]