I Looked Into Fujiyama Onsen

Not just campsites - depending on the weather or my mood, I keep researching candidates for those "let's make today a hotel getaway" moments, almost like an ongoing series on this blog.

This time I looked into Fujiyama Onsen, a day-use hot spring facility in Fujiyoshida City, Yamanashi Prefecture. I got curious about its location right next to Fuji-Q Highland and its solid wood bath hall, said to be one of the largest of its kind in Japan, so I decided to dig a little deeper.

What Is Fujiyama Onsen, Famous for Its Solid Wood Bath Hall?

Fujiyama Onsen is apparently a day-use bathing facility in Fujiyoshida City, Yamanashi Prefecture. The bathhouse building recreates a "machiya-style" townhouse design modeled after the Kusakabe House, an Important Cultural Property in Hida-Takayama, and one of the highlights seems to be the beam framework built using traditional joinery techniques without nails. With a ceiling height of 12 meters and a total floor area of over 100 tsubo (roughly 330 square meters), the solid wood bath hall is said to be one of the largest of its kind in Japan, and even just from photos it looked pretty impressive.

One thing to note - at the time I was researching this article (August 2026), the facility was apparently already closed for a renovation, and during that closure, some damage was found after an earthquake, so according to the official site, it remains closed for the time being. There's no set date for reopening, so if you're thinking of visiting, it seems best to check the latest updates on the official site before making plans.

The water is apparently a magnesium-calcium-sodium bicarbonate-sulfate-chloride spring, generally classified as a bicarbonate spring. The source water, at 30 degrees Celsius, is heated and recirculated (without adding water), and it seems to contain metasilicic acid, which is said to be good for the skin.

• Admission fee (general rate, after the April 2026 revision): weekdays - adults 1,900 yen / children 950 yen; weekends and holidays - adults 2,300 yen / children 1,150 yen, apparently
• Admission fee (LINE members): weekdays - adults 1,200 yen / children 600 yen; weekends and holidays - adults 1,600 yen / children 800 yen - signing up for membership seems to bring the price down a bit
• Morning bath: 6:30-9:00, adults 800 yen / children 400 yen, which appears to be a separate pricing structure from the regular business hours (10:00-23:00, last entry 22:00)
• Regular closing days: basically irregular, though the notice mentioned the facility may close for a few days a year for inspections
• Reservations: no reservation needed for regular day-use bathing; only banquet plans or group use require a phone reservation at least 3 days in advance, apparently
• Payment: it seems credit cards in general, e-money, and PayPay are all accepted

Checking Out the Baths, Sauna, and Hot Stone Bath

The indoor baths seem to offer quite a variety, including a granite main bath (42°C), a carbonated spring bath using an artificial carbon dioxide generator to achieve a high concentration of 1000ppm, a rotating vanadium bath (natural vanadium water drawn from 150 meters underground, 40°C), jet baths and a reclining bath, and a cold bath (16°C). The outdoor bath is built in a Japanese garden style using green "Hayakawa stone" from a tributary of the Fuji River, and apparently there's also a gazebo built by a master carpenter from Hida-Takayama.

The sauna, called "FUJIYAMA SAUNA," apparently uses an automatic sauna water system (loyly) that sprays natural Mt. Fuji water onto sauna stones mixed with Mt. Fuji lava rock. The room temperature is reportedly 86°C for men and 80°C for women, which sounds like it should get you sweating pretty well. That said, I couldn't find any specific mention on the official site about whether there's an outdoor cool-down area, so that part remains unclear.

The 4th floor seems to have an area combining a hot stone bath with a Mt. Fuji view, a lie-down hot stone bath, a heated-floor hot room, and a manga corner. The hot stone bath costs extra on top of admission (normally 680 yen, or 610 yen if applied for together with admission), and it's apparently not available to elementary school children or younger.

Relaxation Spaces and Dining That Caught My Indoor-Loving Eye

The 3rd floor observation lounge is tatami-matted with plenty of cushions, and it seems to be one of the main spots for viewing Mt. Fuji while lying down. The same floor apparently also has a hammock room (with 6 hammocks) and a kids' room, which sounded like a great setup for someone like me who likes to take it easy indoors. The 2nd floor relaxation room, called "Utata," reportedly has 36 reclining chairs lined up, each equipped with a 15-inch TV.

There's also a treatment menu that includes massage, aroma treatments, and a body-cleaning service that serves as an alternative to a traditional skin scrub, all of which apparently require a reservation. Meals are served at "Fujiyama Dining" on the 2nd floor, with menu items like a loaded stone-grilled yakisoba, tempura soba on a bamboo tray, spicy-savory hoto noodles, and Shingen soft-serve ice cream, along with the local Fujiyama beer. There are also apparently several banquet plans for groups of four or more, which include admission, a towel, in-house clothing, and meals.

Lockers for valuables are free, while lockers for luggage cost 500 yen, apparently. In-house clothing, a face towel, and a bath towel are included in the admission fee, so it seems like a setup where you can go without bringing anything. It's also worth checking a few notes in advance - pets aren't allowed, and mixed bathing for children aged 7 and up is prohibited by local ordinance.

Rakuten Mobile Signal Conditions

I checked using the official "My Area Network Simulation" tool, entering the location of Fujiyama Onsen (the Shin-Nishihara area of Fujiyoshida City), and the overall rating came out as "AAA." Since this is a result actually produced by Rakuten Mobile's own official tool, it should serve as a useful reference when checking signal conditions.

Given that the area is right next to Fuji-Q Highland and has quite a few tourist facilities nearby, having something to reference for connectivity felt like a nice bonus. Since the building is apparently made of solid wood with high ceilings, the actual indoor reception might vary depending on personal experience, but at the very least, this area rating should give a useful general idea.

Access and Nearby Spots to Check Out

By car, it's apparently about 1 minute from the Kawaguchiko IC on the Chuo Expressway, and from the Gotemba direction, going via the Higashi-Fuji-Goko Road takes roughly 50 minutes as a general guide. By train, there's a free shuttle bus from either Fujisan Station or Kawaguchiko Station on the Fujikyu Line - about 30 minutes from Fujisan Station and about 20 minutes from Kawaguchiko Station. There's also apparently a route via highway bus from Busta Shinjuku to the "Fuji-Q Highland" bus stop, taking around 100 minutes.

Since it's right next to Fuji-Q Highland, it looked like an easy stop to combine with the park's attractions and other nearby sights like the Fujiyama Museum. There also seem to be several shops in the area serving Yoshida-style hoto noodles, so it might be worth planning a meal after the bath. That said, I couldn't find any mention of parking capacity or fees on the official site, so that part remains unclear.

Wrapping Up

Looking back over everything, Fujiyama Onsen left me with the impression that its biggest highlight is the solid wood bath hall, built using traditional joinery without nails and said to be one of the largest of its kind in Japan. It also seems to have plenty of facilities for taking it easy indoors, like the carbonated spring bath, vanadium bath, sauna with automatic loyly, and the observation lounge with views of Mt. Fuji. That said, at the time I was researching, the facility was apparently still closed due to earthquake damage, so if you're planning to actually go, it's probably best to check the official site for the current status first.

As for Rakuten Mobile's signal, the official tool showed an AAA rating. If you're curious, it might be worth checking the actual result yourself using Rakuten Mobile's official "My Area Network Simulation" tool, just like I did.

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Related Links

• Official Site