The 3000 series was the first Keio rolling stock to use completely stainless steel body construction.

[1] A total of 29 5-car sets (145 cars) were built from 1962 by Tokyu Car, and in 1963, the design was the recipient of the third Laurel Prize presented annually by the Japan Railfan Club.

A number of trains were later resold to operate on other lines throughout Japan.

[1] The fleet underwent refurbishment from 1996, with the original fibre-reinforced plastic (FRP) cab ends replaced by new steel cab ends with panoramic windscreens and front skirts.

[4][7] Car 3719 is preserved at the Keio Rail-Land open-air museum next to Tama-Dōbutsukōen Station on the Keio Dōbutsuen Line in Hino, Tokyo, which opened in October 2013.