Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The line opened as a one-stop single-track spur from Chofu to Tamagawahara on June 1, 1916. It was doubled on April 1, 1924. On May 1, 1937 Tamagawahara was renamed Keio-Tamagawa, and on August 4, 1963 the line was finally electrified. The line was first extended on April 1 1971, to Keio-Yomiuri-Land. Subsequent extensions brought the line to Keio-Tama-Center (October 18, 1974), Minami-Osawa (May 22, 1988) and Hashimoto (March 30, 1990). Tamasakai station opened on April 6, 1991. Between 1992 and 2001, a limited express service existed, stopping at Chofu, Keio-Tama-Center, and Hashimoto.

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