Cabinet of Japan
National Route 112 was established by the Cabinet of Japan on 18 May 1954 as Secondary National Route 112 between the cities of Yamagata and Tsuruoka. The highway was reclassified as General National Route 112 on 1 April 1965. On 1 April 1993, the highway's ending point was shifted from Tsuruoka to Sakata following an order from the Cabinet of Japan.