Kōshū Kaidō
The shared facilities for the Toei Shinjuku subway line and the Keiō New Line are distinctively called and consist of two platforms stretching east-west five floors beneath the Kōshū Kaidō avenue to the southwest of the JR section. The concourse is managed by Keio Corporation but is in a separate location to the main Keio platforms. Further south (and deeper underground) are the two north-to-south Toei Ōedo subway line platforms.