Toshimaen Niwa no Yu

Toshimaen Niwa no Yu is a highly regarded natural hot spring and spa day facility in Nerima Ward, Tokyo, located a short walk from Toshimaen Station on the Seibu Ikebukuro Line — just 14 minutes from Ikebukuro. The facility draws mineral-rich hot spring water from a depth of 1,445 metres, offering a range of therapeutic bathing experiences across separate male and female onsen sections. A standout feature is the Baden Pool zone, where visitors can enter in swimwear for a mixed-gender aquatic therapy experience including hydrotherapy jets, an outdoor natural hot spring jacuzzi, and a soft-water jacuzzi. The outdoor Finnish sauna is open to both genders and is especially popular with couples. Additional facilities include a steam room, cold plunge pool, stone sauna, and an indoor Finnish sauna. The on-site restaurant Ryokusuitei serves Japanese cuisine with views of the garden. The facility is open daily from 10am to 11pm, with discounted evening rates after 6pm on weekdays. Tattoos, including sticker-type tattoos, are not permitted. A rental bathing suit is available for guests unfamiliar with Japanese onsen customs. The official website confirms the facility remains actively operating.