Toki no Irodori Onsen

Toki no Irodori (季乃彩) is a premier natural onsen sanctuary located in Inagi City, nestled on the verdant fringes of the Tama River just under an hour from central Tokyo. Situated in a residential pocket of the Tama Hills that few international tourists ever visit, this is an onsen truly “for the locals.” It serves as a vital community “lull,” where families and salarymen alike head to decompress after the work week. Despite its suburban setting, the facility avoids the sterile feel of a city bathhouse, opting instead for a traditional wooden aesthetic that feels more like a secluded mountain retreat.

The facility operates a streamlined “one-wristband” payment system. Upon entry, visitors receive a barcoded band used to track all expenses—from the entrance fee and vending machine drinks to a session in the hair salon or a meal at the Shiki-na restaurant. This allows for a completely cashless experience inside the bathing and relaxation zones, with the final balance settled at the automated machines upon checkout.

Toki no Irodori Entrance — The grand entrance at Toki no Irodori belies its affordable, local pricing.

The Golden Water and Diverse Baths

The standout feature of Toki no Irodori is its “Kogane-no-yu” (Golden Water). Drawn from deep within the Kanto plain, this natural spring is rich in sodium chloride and iron, giving it a distinctive amber hue. This mineral profile is highly regarded for its “heat-retaining” properties, helping to soothe muscle pain and improve circulation long after you’ve left the water. The bathing area features over ten distinct zones, including rotenburo (outdoor baths) set amidst seasonal flora, a carbonated “soda” bath, and the popular nekorobi (lying-down) area where water trickles over heated stones.

For those who enjoy heat therapy, the facility boasts a spacious dry sauna equipped with a television—a hallmark of Japan’s more social, local bathhouses—and a high-humidity mist sauna. However, the true hidden gem is the Ganbanyoku (stone sauna) area. This dedicated wing features four thematic rooms, including a “Salt” room and a “Hoseki” (Gemstone) room, where guests lie on heated mineral slabs to detoxify via far-infrared rays. This section requires a separate yukata and a small additional fee, but it offers a significantly quieter and more meditative environment than the main public pools.

Restaurant Display at Toki no Irodori — The Shiki-na restaurant offers a broad menu of seasonal Japanese comfort food, making it easy to make a half-day trip of your visit.

Visitor Information
Address	1522-1 Yanokuchi, Inagi-shi, Tokyo 206-0812 (Google Maps)
Opening Hours	9:00 AM – Midnight (Sat/Sun/Holidays: 7:00 AM – Midnight)
Price	¥830 – ¥980 (Adults), ¥450 – ¥500 (Children) *Prices vary by weekday/weekend
Website	Visit Website

Access
Station	Line(s)	Access Details
Yanokuchi Station	JR Nambu Line	Approx. 5-minute walk from the South Exit.
Inagi Station	Keio Sagamihara Line	15-minute walk or a short bus ride toward Yanokuchi.