＝ Annex ＝
Skin-nourishing simple alkaline waters,
100% free-flowing from the source
Onsen
A 400-year-old hot spring source preserved by our "Yuban",
offering supreme tranquility imbued with the romance of the Taisho era.
Since its discovery in 1614 (Keichō 19), the hot springs of Tonosawa in Hakone have continued to heal the minds and bodies of countless spa guests and historical figures for nearly 400 years.
The Art of the "Yuban"
Our "Yuban" (hot spring masters) meticulously adjust the flow from our three private springs to match each day’s weather and temperature, ensuring every bath is lavishly filled with 100% free-flowing spring water directly from the source.
With a pH of 8.9, this simple alkaline hot spring feels gentle and velvety on your skin, delicately exfoliating dead skin cells to leave you remarkably smooth, supple, and deeply moisturized—a truly transformative, beautifying bath experience.
Taisho-style Bathhouse
Featuring beautiful mosaic tiles imported during the Taisho era adorning the bathtubs and floors, this retro-modern space evokes the romance of the Taisho era. The walls are adorned with rugged natural stone, and light streaming through Taisho-era stained-glass windows gently makes the water shimmer. The men’s bath features a waterfall shower and a fan-shaped tub, while the women’s bath boasts a modern art-inspired design centered around white. Please enjoy the ultimate bathing experience.
Mountain Stream Open-Air Onsen (Suiun-no-Yu, Seikan-no-Yu)
A spectacular open-air bath offering a close-up view of seasonal flowers blooming on the mountainside, lush green trees, and the clear waters of the Hayakawa River. In both the men’s bath, “Suiun no Yu,” and the women’s bath, “Seikan no Yu,” you can indulge in the luxurious experience of a free-flowing natural hot spring while listening to the sounds of nature. From 10:00 p.m. to 4:00 a.m. the next morning, when the resort is enveloped in the stillness of the late night, the baths transform into private hot springs available for your exclusive use. Please enjoy this special moment filled only with the sounds of the wind and water.
Private Bath "Suehiro no Yu"
Located on the 3rd floor of the hotel, this private hot spring bath is known for its spacious and relaxing atmosphere.
No reservation is required, so you can easily drop by directly from your room. Simply hang the wooden sign at the entrance to read “In Use,” and you can enjoy a private soak at any time. Please relax and savor the high-quality, naturally flowing spring water in this quiet, private space.
Ganbanyoku (Healing Stone Spa)
An authentic hot stone bath facility that generously features “Black Silica,” a natural mineral from Hokkaido. The abundant far-infrared rays emitted by Black Silica gently warm your body to the core, gently relieving daily stress and travel fatigue, and restoring healthy circulation.
Annex
An open-air onsen exclusively for guests staying in the annex,
where you can experience the sound of the waterfall and the atmosphere of nature up close
Annex Open-Air Onsen
“Fuji-no-Yu (Men’s)” and “Nire-no-Yu (Women’s)”
Located in the annex building, this open-air onsen features a direct flow of spring water and overlooks the waterfall right in front of it. The alkaline simple spring water, known for its gentle, smooth texture on the skin, is effective for promoting beautiful skin, relieving fatigue, and reducing stress. At dusk, as the murmur of the waterfall gives way to the stillness of the night, experience the luxury of having your senses sharpened while soaking in the warm waters. The bath is available for use even in the middle of the night.
Time-Limited Private Hot Spring
From 4:00 PM to 7:30 PM, we offer 30-minute private sessions per group (advance reservations required; cleaning time is scheduled after each session). Please enjoy a bath where you can become one with the nature right before your eyes in a private space free from disturbances. After 8:00 PM, the baths are open to the public, separated by gender, and you are welcome to use them at any time throughout the night.
- Spring Water QualityAlkaline Simple Spring (100% natural hot spring water, direct flow from the source)
- BenefitsNerve pain, muscle pain, rheumatism, fatigue relief, recovery from illness, skin beautification
- Hours of Operation4:00 PM to 9:30 AM the following day (open for bathing late at night)
- Private Rental Times16:00〜16:30 / 17:00〜17:30 / 18:00〜18:30 / 19:00〜19:30(Free; advance reservation required)*A 30-minute cleaning and disinfection period follows the end of each private session.
- General Bathing Hours8:00 PM to 9:30 AM the following day (Separate facilities for men and women)
A Tour of the Main Building’s “Taisho-era Baths”: A Journey Through History
Guests staying in the Annex are also welcome to use the hot springs in the “Main Building,” a registered tangible cultural property. Enjoy the retro “Taisho Bath,” an indoor bath exuding the romance of the Taisho era, or treat yourself to a luxurious hot spring tour that takes you through the Main Building’s open-air baths. The modernity of the Annex and the overwhelming historical charm of the Main Building—experiencing both is a special way to stay that is unique to our hotel.
- Bath FacilitiesMain Building Indoor Bath (Taisho-style Bath),
Main Building Open-Air Bath, Main Building Suehiro no Yu (Private Bath) - Hours4:00 PM – 9:30 PM (Last admission at 9:00 PM) / 7:00 AM – 9:30 AM the following day (Last admission at 9:00 AM)
- NotesThe Main Building and Annex are not connected.
You will need to walk outside to reach the Main Building. - Bathroom FixturesCera Trading’s Commitment to Quality
● Sink Basins: DURAVIT (Germany)
● Faucets: ZUCCHETTI (Italy), VOLA (Denmark) (Main Building)
