 In 1922, the Railway Construction Act was amended by the Diet, and a new rail line connecting Kisarazu Station to Ōhara Station on the Sotobō Line via Kururi and Ōtaki, to transect the Bōsō Peninsula, appeared on the list as compensation for the underdeveloped network of roads in the area at that time.On 1 September 1923, the Kisarazu to Kururi Line was nationalised, and the line was named the Kururi Line under the Japanese Government Railways (JGR) system.On 20 August 1930, the track gauge was widened to , and on 25 March 1936, the line was extended to Kazusa-Kameyama Station.