The Tokyu Corporation began preliminary work on a train line connecting Itō Station, the terminal station of the Japan National Railway’s Itō Line, with Shimoda, at the southern tip of the Izu Peninsula in 1956. A wholly owned subsidiary, the Itō-Shimoda Electric Railway Company (伊東下田電気鉄道株式会社,Itō-Shimoda Denkitetsudo K.K.?) was created on April 11, 1959 and construction work on the new line began in February 1960. On February 20, 1961, the company changed its name to its current name of Izukyū Corporation. Actual train operation began at Itō Station on December 10, 1961, and a centralized traffic control center established at Itō in 1982.
Izukyū Corporation was listed in the Second Section of the Tokyo Stock Exchange from November 1, 1972. However, it was delisted on October 1, 2004 and returned to the status of a fully owned subsidiary of the Tokyu Corporation.