緑鴎
Located within the Keio Mall, this underground parking lot at Keio Department Store Shinjuku offers both self‑parking and mechanical sections; however, the mechanical area has been designated a mechanical‑only zone.





Keio Underground Parking is a 50-year-old underground car park at 1-1 Nishi-Shinjuku, sitting beneath the Shinjuku Nishiguchi Keio Department Store complex immediately adjacent to Shinjuku Station's west exit. Operated by Keio Chika, the facility is one of the most central parking options for visitors driving into the Shinjuku area, with direct access to the Keio Mall, Keio Department Store and the wider Nishi-Shinjuku office district. Its long operating history has made it a familiar landmark for locals and a Mechanical Engineering Heritage site recognised by the Japan Society of Mechanical Engineers. The site offers a flat parking area with 24-hour access alongside a mechanical "rotopark" system with 188 spaces, where staff handle entry and exit so that less confident drivers need not worry about manoeuvring into tight bays. Standard and large vehicles, including high-roofed models, are accommodated, and charges run at 320 yen per 30 minutes. Discount schemes are available for customers of the linked Keio Department Store, Keio Dining and other partner shops, typically with a minimum spend requirement. The flat parking area operates around the clock, while the mechanical rotopark handles entry and exit between 9:00 and 21:00, so drivers of larger vehicles should plan around those hours. Because the car park sits at the heart of the Shinjuku west exit area, it fills quickly during weekday lunchtimes and weekend evenings, so arriving early improves the chance of a space.
新宿西口エリアの老舗24時間地下駐車場。188台収容で平面・機械式駐車に対応。