Kadoya Ryokan Honkan: A Taisho-Era Wooden Inn at the Quiet End of Itamuro Onsen
Tucked at the deepest end of Itamuro Onsen, a hidden hot-spring valley in the foothills of the Nasu mountains, stands a three-story wooden inn that has welcomed weary travelers for more than a century. The Main Building (Honkan) of Kadoya Ryokan, completed around 1919 in the eighth year of the Taisho era, is one of the rare survivors of the great fire of 1978 that consumed many of the wooden inns lining this remote valley. Today, its weather-darkened timbers, its delicate wooden balustrade, and its quiet riverside setting offer one of the most evocative glimpses of an old Japanese spa town that you will find anywhere in Tochigi Prefecture.
For visitors who want to step into the world of the early twentieth century, when guests came to Itamuro not for luxury but for healing, Kadoya Ryokan Honkan is a destination of unusual atmosphere and authenticity.
The Story Behind the Building
Itamuro Onsen has a remarkably long history. According to local tradition, the springs were discovered in the year 1059, during the reign of Emperor Goreizei, by a hunter-warlord of the Nasu clan. From those medieval beginnings, the village grew into one of the so-called Nasu Shichiyu, the Seven Hot Springs of Nasu, and earned a reputation across eastern Japan as Shimotsuke no Yakuto, "the medicinal spring of Shimotsuke." The Takanezawa family, who run Kadoya today, count themselves among the five clans that first settled the village some five centuries ago, and they have operated an inn here continuously through the Edo, Meiji, Taisho, Showa, Heisei, and Reiwa eras.
Built for the Tojiba Tradition
The Main Building was raised in around 1919 to serve the tojiba, or therapeutic-bathing tradition. Tojiba guests were not weekend tourists but country people, farmers and travelers who came for stays of ten days or more to soak in the alkaline waters and recover from rheumatism, neuralgia, sore muscles, and the fatigue of hard labor. The building's spare layout, its plain six-mat rooms, and its long shared corridors all reflect this purpose. Photographic records show that the front facade was originally an open-sided pass-through corridor; sometime between 1952 and 1961 this was rebuilt as a bay window with a wooden railing, the form visitors see today.
Surviving the Fire of 1978
In 1978, a great fire swept through Itamuro Onsen and destroyed many of its older wooden inns. Kadoya was one of the few that survived, and it remains one of the most important physical witnesses to what the village looked like in its prewar heyday. This survival is part of why the building was selected for cultural-property registration nearly four decades later.
Why It Was Designated a Cultural Property
On February 25, 2016, the Japanese government registered three of Kadoya Ryokan's structures, the Main Building (Honkan), the Annex (Bekkan), and the Yusenkaku, as Tangible Cultural Properties under the national registration system. The Honkan in particular was recognized for the way it preserves the authentic feel of a Taisho-era wooden tojiba inn.
An Intact Third Floor
One of the most important features of the Main Building, and one of the principal reasons it was designated, is the third floor. Here, the original room arrangement remains essentially intact: a row of five six-mat guest rooms separated only by sliding fusuma panels, with a corridor and staircase on the west side and another corridor running along the east. This layout, where humble rooms open onto a shared passageway with no private bathrooms, is exactly how working-class spa-goers lived for the duration of their long therapeutic stays. Almost nowhere else in Japan can this everyday Taisho-period guest experience be observed in its original architectural form.
A Cohesive Historic Streetscape
The Main Building does not stand alone. Together with the Annex (built in the late Taisho or early Showa period and showing fashionable Western touches such as raised-and-lowered sash windows and German-style stucco on parts of the exterior) and the postwar Yusenkaku of 1952, the three buildings form a continuous row that preserves the historic streetscape of Itamuro at the deep end of the village. It is this collective survival, and not just one structure alone, that gives the property its weight.
Hidden Details Worth Noticing
Within the Main Building, look for the rare hongyo tiles preserved at the old entrance, a holdover from the days when these decorative ceramic tiles were a sign of quality in inn architecture. The door of the old telephone booth has also been kept, relocated but intact, as a small reminder of how communication once worked in a remote mountain village. Such modest details, easy to miss, are precisely what cultural-property status seeks to protect.
Highlights and Things to Look For
The Wooden Balustrade Facing East
From the road below, the most photographed feature of the Main Building is the projecting wooden handrail that runs along its east-facing facade. This element, replacing the original open corridor, is what gives Kadoya its postcard-worthy silhouette. In every season, snow in winter, fresh maple green in spring, and crimson foliage in autumn, the timber balustrade against the dark wooden facade is the defining image of old Itamuro.
The Two Private Hot-Spring Sources
Although the Main Building itself is no longer used for overnight guests, Kadoya owns and maintains two private springs known as Shimotsuke no Yakuto and Reisen, "the spirit spring." The water is a clear, odorless, pH 9.6 alkaline simple spring, traditionally believed to ease neuralgia, rheumatism, joint stiffness, frozen shoulder, bruises, sprains, post-illness recovery, and fatigue. It pours into the baths exactly as it emerges from the earth, without heating or dilution.
The Tradition of Tsuna no Yu
Itamuro is famous for an unusual bathing custom called tsuna no yu, the "rope bath." A thick rope was hung from the bathhouse rafters, and patients held on to it while standing chest-deep in the water, letting the water pressure stimulate circulation. So many guests reportedly arrived with a walking stick and left without one that Itamuro became known as "the spring where canes are not needed." Visitors traditionally left their unused canes at the local Itamuro Onsen Shrine as offerings of thanks.
Getting There and Visiting Around
How to Reach Itamuro Onsen
The most straightforward route from Tokyo is the Tohoku Shinkansen from Tokyo Station to Nasushiobara Station, about one hour and ten minutes. From the West Exit of Nasushiobara Station, a Kanto Bus runs to Itamuro Onsen in roughly fifty minutes. From JR Kuroiso Station, the bus journey is approximately thirty-five minutes. By car, the drive from the Kuroiso-Itamuro Interchange or the Nasu Interchange of the Tohoku Expressway takes about twenty minutes north along the Itamuro Kaido road. The Main Building stands at the very end of the village street, beyond the Annex.
A Note on Access to the Main Building
It is important to know that the Main Building is no longer used for overnight accommodation. The wooden structure has no heating, no central cooling, and rooms without private bathrooms or toilets, conditions that made year-round stays impractical after a century of use. Today, overnight guests of Kadoya Ryokan are accommodated in the connected Annex, while the Main Building is preserved primarily for its cultural-property value. Travelers interested in the building should always confirm directly with the inn what is open and viewable at the time of their visit.
Around Itamuro: What Else to See
Otome no Taki (Maiden's Falls)
About 2.3 kilometers from Itamuro Onsen, on a tributary called the Sawana River that flows down from Mount Shirasasa, you will find Otome no Taki, a graceful waterfall of roughly ten meters in height. Its name, "Maiden's Falls," comes from a local legend in which a beautiful blind young woman, said to be the spirit of a great snake from the wetland upstream, once appeared at the falls. The cascade is at its loveliest in the fresh green of late spring and the deep red of autumn maples.
Numappara Wetland
Higher up the same valley, at an elevation of about 1,230 meters, lies Numappara Wetland, a small alpine marsh roughly 250 meters east-to-west and 500 meters north-to-south. Wooden boardwalks let visitors walk through the wetland in summer, when nikko-kisuge daylilies bloom in masses. The site is also the trailhead for hiking routes up Mount Nasu and to the remote Sandogoya Onsen. The access road is generally open from May to mid-October only.
Kinomata Ravine and Miyama Dam
For travelers with a car, the Kinomata Ravine offers clear blue-green pools and a suspension bridge over giant boulders, while Miyama Dam farther up the river presents a sweeping reservoir view backed by the Nasu mountains. These are quiet places, rarely crowded, and they pair beautifully with a slow soak in Itamuro's healing waters at the end of the day.
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Q&A
- Can I stay overnight in the Main Building itself?
- No. The Main Building is preserved for its cultural value but is no longer used for overnight guests. Travelers who book a stay at Kadoya Ryokan are accommodated in the connected Annex, where the same private hot-spring waters are piped to the baths.
- When was the Main Building built and when was it designated?
- The Main Building was constructed around 1919, the eighth year of the Taisho era. It was registered as a Tangible Cultural Property of Japan on February 25, 2016, together with the Annex and the Yusenkaku.
- What kind of hot spring does Itamuro have?
- Itamuro is a clear, colorless, odorless alkaline simple spring with a pH of around 9.6. It has been valued for centuries for soothing neuralgia, rheumatism, sore joints, bruises, and general fatigue, and is known historically as Shimotsuke no Yakuto, "the medicinal spring of Shimotsuke."
- What is the best season to visit?
- All four seasons have their charms. Late spring brings new green to the valley, summer offers a cool mountain retreat, autumn paints the slopes in vivid color, and winter wraps the wooden inns in deep snow. Travelers planning to visit Numappara Wetland should aim for the May to October window when access roads are open.
- Is Itamuro Onsen suitable for international travelers who do not speak Japanese?
- Itamuro is a small, traditional spa village rather than an international resort, so English-language signage and services are limited. Visitors comfortable with simple Japanese phrases, a translation app, and a willingness to embrace local customs will find the experience deeply rewarding. It is wise to confirm bookings and any visitor access in advance.
Basic Information
| Name | Kadoya Ryokan Honkan (Main Building) |
|---|---|
| Designation | Registered Tangible Cultural Property of Japan (Buildings) |
| Date Registered | February 25, 2016 |
| Year Built | Around 1919 (Taisho 8) |
| Structure | Three-story wooden building, iron sheet roofing, building area approximately 114 square meters |
| Number of Buildings | One |
| Address | Itamuro aza Shiozawa 854 and others, Nasushiobara City, Tochigi Prefecture |
| Operator | Kadoya Ryokan |
| Access | Approximately 50 minutes by Kanto Bus from JR Nasushiobara Station West Exit to "Itamuro Onsen" stop, then about 1 minute on foot. By car, around 20 minutes from Kuroiso-Itamuro IC on the Tohoku Expressway. |
References
- Kadoya Ryokan / Nasushiobara City Official Website
- https://www.city.nasushiobara.tochigi.jp/soshikikarasagasu/shogaigakushuka/bunkazai/2/6/2615.html
- Kadoya Ryokan Honkan / Cultural Heritage Online
- https://bunka.nii.ac.jp/heritages/detail/254505
- Registered Tangible Cultural Property Inn Kadoya / Official Site
- https://bunkazai-kadoya.com/
- About / Kadoya Ryokan Official Site
- https://nasu-kadoya.jp/about/
- Itamuro Onsen / Japan Spa Association
- https://www.spa.or.jp/kokumin/927/
- Itamuro Onsen / Wikipedia (Japanese)
- https://ja.wikipedia.org/wiki/板室温泉
- Itamuro Area / Nasushiobara Tourism NAVI
- https://nasushiobara-kanko.jp/areas/itamuro/
Last verified: 2026.05.07