The first section from Otoineppu to Shō-Tombetsu was opened in 1914. All section was opened in 1922, as the first railway line for Wakkanai. In 1926, Teshio line via Horonobe was opened. From Otoineppu to Wakkanai, the distance of this line was longer than Teshio line. In 1930, Teshio line was integrated into Sōya Main Line, and this line was separated from it and renamed Kitami line.[1]
In 1961, Kitami line was renamed to Tempoku line. In 1987, JNR was privatized, and this line was inherited by JR Hokkaido, but abandoned on 1 May 1989.