 The Sendai - Yatsushiro section was built by the (then) Japanese Imperial Railway and opened between 1922–27, at which time this route replaced the Hisatsu Line to become the southern part of the Kagoshima Main Line.The Yunoura - Tsunagi section was duplicated between 1966 and 1968.CTC signalling was commissioned from Yatsushiro - Sendai in 1969/70, and the line was electrified in 1970.