Toshimaen Niwa no Yu

About

Toshimaen Niwa no Yu is the kind of place that makes you wonder why every city doesn't have one. Set on the grounds of the former Toshimaen amusement park in Nerima, it wraps traditional onsen facilities around a proper Japanese garden — mature trees, stone pathways, the kind of landscaping that takes decades to develop. The outdoor baths nestle into this garden setting, and soaking under open sky with greenery on all sides produces a calm that central Tokyo facilities can't match. The bade pool is the revelation. At 35 degrees Celsius, it sits in the sweet spot between warm bath and swimming pool — hot enough to relax every muscle, cool enough to stay in for extended periods. Crucially, it's co-ed with swimwear, which means couples and friend groups can share the experience together rather than splitting into gender-separated bathing floors. In a country where onsen culture is traditionally segregated, this is quietly radical. The pool attracts a mix of fitness swimmers doing gentle laps and social groups chatting in the warm water. The sauna lineup covers more ground than expected: a proper Finnish dry sauna, a Korean-style jjimjilbang room, and a wet steam bath. The outdoor jacuzzi, tucked into the garden, is best on cool evenings when steam rises into the trees. The whole facility has a suburban Japanese warmth — less polished than the central Tokyo flagships, more relaxed, more neighbourhood. Families come on weekends, retirees on weekday mornings, couples on evening dates. It's social wellness at its most natural and unforced.

Treatments & Services

Signature: Co-ed bade pool at 35C in Japanese garden setting

Highlights

• ✓Unique bade pool (35C co-ed swimwear pool)
• ✓Set within traditional Japanese garden
• ✓Finnish, steam, and Korean saunas
• ✓Outdoor jacuzzi and open-air baths
• ✓Former Toshimaen amusement park site