 The Sōtetsu and Yokohama Municipal Subway stations are both underground, and both have a single island platform.Shōnandai Station was opened on November 7, 1966 as a station on the Odakyū Enoshima Line.The station was greatly expanded in 1999 with the addition of the Sagami Railway Izumino Line on March 10, and the Yokohama Subway Blue Line on August 29.