Nagato Yumoto Onsen: Day-Use Hot Spring Baths & Prices

Spreading along the Otozure River that flows through the center of Nagato City, this hot-spring town is said to be the oldest in Yamaguchi Prefecture. Inns, riverside kawadoko terraces, and eateries line the riverbank, and recent redevelopment has reborn the town as a place delightful for strolling. "Onto," the drop-in bath that is the origin of the whole hot spring town, is one of the very few bathhouses in Japan where the source wells up from beneath your feet in the tub itself.

Highlights

Onto is built directly above the spring source, so you can watch the water bubbling out of the bedrock while you bathe. It deliberately has no sauna or jacuzzi; the building is designed so that you experience nothing but naturally welling water. The Otozure River is crossed by stepping stones and five submersible bridges that let you reach the far bank, and a stepped "gangi plaza" has been built so you can descend to the water's edge. The kawadoko river terraces — said to be the only ones in Yamaguchi Prefecture — are at four locations: in front of Otanisanso, in front of Hoshino Resorts KAI Nagato, in front of Onto, and in front of Gyokusenkaku. At dusk, the bamboo-grove staircase and the bridges are lit up. At the public bath "Onto," built atop rocks where the source rises, you can savor the clear, gentle water up close while watching it flow out from the bedrock. It reopened after renovation in 2020, drawing attention. At night, bamboo lanterns glow and a dreamlike scene spreads across the river surface. With the addition of a Hoshino Resorts inn, the whole town brims with new appeal.

From a Revelation of Sumiyoshi Daimyojin in 1427

The founding history of Onto goes back to 1427 (Oei 34). Tradition holds that Zen master Jo-an, the third abbot of the Soto Zen temple Taineiji, discovered it as "water bestowed by the gods" through a revelation from Sumiyoshi Daimyojin, the first-ranked shrine of Nagato Province — and even today the spring source is the property of Taineiji. The shimenawa rope strung between the bedrock and the pool of water was bestowed by Sumiyoshi Shrine, the first-ranked shrine of Nagato Province, in Shimonoseki. The layout, in which the washing area is set apart from the bathtub, also follows the idea of separating "the place for removing dirt" from "the place of purification."

From the modern era onward this bath was loved as a municipal public bathhouse, but with the facility aging and users declining, Onto ended its publicly built and publicly run operation in May 2017. "Reito," the other municipal bathhouse, ended operations on March 31, 2019. Onto was subsequently rebuilt by Nagato Yumori Co., Ltd., founded by young people from the community, and reopened in March 2020. The design was handled by Shohei Oka — known for the architecture of Busshozan Onsen in Kagawa — and Tamura Design Office.

Understanding How the Water Is Used

Onto's water is free-flowing from the source (a discharge system). The source is named "Onto-sen," with a natural discharge of 131 liters per minute and no recirculation. Heating is also explained officially: it is done only during the winter period and kept to a minimum. In other words, in summer you bathe at the untouched source temperature.

The source temperature is 37–39°C, and the water poured into the tub is 36–38°C — close to body temperature. Onto itself recommends "the way of lukewarm water," a style of bathing in which you soak slowly for a long time. The spring quality is an alkaline simple spring with a pH of 9.62, and the water carries a faint scent of sulfur.

One more thing worth knowing is the depth of the bath. Whereas the tubs at ordinary public bathhouses are around 50 to 60 centimeters deep, Onto's is about one meter. This is because the "foot-of-the-bath spring" is in the floor of the tub itself, and it was built deep to make the most of that water. While it means your whole body is enveloped in water that has not yet touched the air, it is worth remembering that getting in and out involves a fair depth. Each of the men's and women's tubs measures 8 square meters, and it is a small bath that holds only 8 people in the tub and 8 at the washing area at once.

Seasonal Enjoyment

Riverside cherry blossoms in spring, cool river breezes in summer, and the foliage of the surrounding mountains in autumn give each season its own face. Foot-bath hopping at dusk is a pleasure throughout the year.

Access and Basic Information

About a 15-minute walk from Nagato Yumoto Station on the JR Mine Line (a substitute bus may run depending on service conditions). About 30 minutes by car from the Mine IC on the Chugoku Expressway. Onto has irregular closing days, so confirming in advance is recommended.

A Word of Advice

Changing into a yukata and walking along the river lets you savor the atmosphere of this quiet spa town all the more.

Practical Information

• Spring quality: Alkaline simple spring (pH 9.62, with a faint sulfur note). The source is named Onto-sen, and the source owner is Taineiji temple
• Indications: Neuralgia, muscle pain, joint pain, recovery from fatigue, health promotion, and more
• How the water is used: Free-flowing from the source (discharge system). Naturally welling, and welling from beneath the bather's feet. Heating is carried out only during the winter period and kept to a minimum
• Source temperature and discharge: 37–39°C, 131 liters per minute (natural discharge). The water temperature in the tub is 36–38°C
• Onto's hours and closing days: 10:00–22:00, irregular closing days (announced on the official website and social media)
• Onto's bathing fee: Adults 990 yen, children (ages 4–12) 500 yen, ages 3 and under free. Re-entry on a single bathing ticket is not permitted
• One-day bathing pass: Adults 1,500 yen, children 600 yen. Re-entry is allowed on the same day only (sales are suspended from July 21 to August 31)
• Coupon books: A book of 11 tickets costs 8,800 yen for adults and 4,400 yen for children
• Private bathing: The first bath of the day, from 7:40 to 8:40, can be reserved privately by two groups per day at 30,000 yen per group (tax included, maximum 6 people, reservations required at least three days in advance). The premium toji plan from 10:00 to 21:30 is limited to three people per day by advance reservation at 15,000 yen
• Open-air bath and sauna: Onto has neither (only separate indoor baths for men and women). A sauna is available at nearby SOIL Nagatoyumoto for 1,500 yen on its own, or 2,000 yen as a set with an Onto bathing ticket
• Amenities: Shampoo, conditioner, body soap, and hair dryers are provided. Towels cost extra: a logo towel is 280 yen, a bath towel 700 yen, a towel and bath towel set 900 yen, a wash towel 150 yen, a hairbrush 150 yen, and a shower cap 100 yen
• Tattoos: Anyone with tattoos, large or small, may not enter. Pets, and photography in the changing rooms and bathing areas, are also prohibited under the terms of use
• Bath depth: About one meter. Care is needed when bathing with small children
• Rest space: A post-bath lounge reserved for bathers can be used free of charge. The tearoom, glassed on three sides with a view of the Otozure River, is for customers ordering food and drink, and at busy times non-bathing use may be restricted. Bringing your own food and drink into the rest room is not allowed
• Rail service status: The JR Mine Line has been suspended between Asa and Nagatoshi since the heavy rain of June–July 2023, and transport to Nagato Yumoto Station continues by substitute bus (with a timetable revision in April 2026). Anyone planning to come by train should check in advance
• Access: About a 15-minute walk from Nagato Yumoto Station. By bus, get off at the "Nagato Yumoto Onsen Parking" stop and walk 5 minutes. By car, about 30 minutes from the Mine IC on the Chugoku Expressway. The address is 2265 Fukawa-Yumoto, Nagato City, Yamaguchi Prefecture
• Parking: Onto has no dedicated parking; use the municipal "Nagato Yumoto Onsen Parking" (paid) along National Route 316. On weekdays it is 200 yen for the first 2 hours and 100 yen per hour thereafter, up to a maximum of 1,000 yen (within 24 hours of entry). On weekends and public holidays it is 200 yen for the first hour and 100 yen per 30 minutes thereafter, up to a maximum of 1,000 yen. From 18:00 to 8:00 the next morning it is 50 yen for the first hour and 50 yen per hour thereafter. Motorcycle parking is free
• Other drop-in baths in the hot spring town: Haradaya Ryokan charges 500 yen for adults and 300 yen for children (age 4 through elementary school); Hotel Nagato Harada charges 700 yen for adults and 500 yen for children; Gyokusenkaku charges 1,300 yen for adults and 600 yen for children; and Otanisanso charges 2,500 yen for adults and 1,250 yen for elementary school children
• Time to allow: One to two hours for a bath at Onto and the post-bath lounge. Half a day if you walk out to the river terraces, the stepping stones, and the illuminations
• To avoid the crowds: Onto shows live crowding information for the men's and women's baths on its official website. Checking before you set out can cut your waiting time

Practical Travel Notes

• Water quality: Alkaline simple spring (pH 9.62). Onto's source temperature is 37–39°C, a clear water with a gentle feel on the skin.
• Day-use bathing: Day bathing is available at the public bath "Onto." It has irregular closing days, so confirming these along with fees and hours in advance is recommended. The former "Reito" bath closed on March 31, 2019.
• Redevelopment: The townscape along the Otozure River was recently renewed, and a Hoshino Resorts inn opened in 2020. The project has received design awards.
• Access: About a 15-minute walk from Nagato Yumoto Station on the JR Mine Line (a substitute bus may run depending on service). About 30 minutes by car from the Mine IC on the Chugoku Expressway.
• Parking: A shared paid municipal parking area is available in the hot-spring town.

📚 Sources

The spring quality, pH, source temperature, discharge, the way the water is used (free-flowing from the source, with minimal heating only in winter), the hours, the bathing fees, the fees for private bathing and the premium toji plan, the prices of towels and amenities, the parking fees, and the depth and size of the bath were confirmed on Onto's official website, on its "Facility Guide," "Fees," "Spring Quality and Overview," and "Etiquette at Onto" pages. The rules on tattoos, photography, and pets come from the terms of use on the same site. The access details, the kawadoko river terraces, the stepping stones, the fees for other drop-in baths in the hot spring town, and the substitute bus service on the JR Mine Line come from the official Nagato Yumoto Onsen tourism site. The closing date of Reito was confirmed in an article on the official Nagato City website. Details are subject to change, so please check official sources before visiting.

Practical Information for Your Visit

• Spring quality: Alkaline simple spring (pH 9.62, with a faint sulfur character). The source is named Ontosen, and the source is owned by Daineiji Temple
• Indications: Neuralgia, muscle pain, joint pain, relief of fatigue, general health promotion and more
• How the water is used: Free-flowing from the source (with the overflow drained away). The water rises naturally, welling up beneath your feet. It is heated only minimally and only during the winter months
• Source temperature and yield: 37 to 39 degrees, 131 liters per minute (natural flow). The water in the bath is 36 to 38 degrees
• Opening hours and closing days of Onto: 10:00-22:00, with irregular closing days (announced on the official website and social media)
• Bathing fee at Onto: 990 yen for adults, 500 yen for children (age 4 to 12), free for children aged 3 and under. Re-entry is not allowed with a bathing ticket
• One-day pass: 1,500 yen for adults and 600 yen for children. Re-entry is allowed on the same day only (sales are suspended from July 21 to August 31)
• Ticket books: A book of 11 tickets costs 8,800 yen for adults and 4,400 yen for children
• Private bathing: The first bath of the day from 7:40 to 8:40 in the morning can be reserved privately by up to 2 groups a day, at 30,000 yen per group (tax included, up to 6 people, reservations required at least 3 days in advance). The premium toji (hot spring cure) plan from 10:00 to 21:30 is limited to 3 people a day by advance reservation and costs 15,000 yen
• Open-air bath and sauna: Onto has neither (only separate indoor baths for men and women). For a sauna, SOIL Nagatoyumoto nearby charges 1,500 yen on its own, or 2,000 yen as a set with an Onto bathing ticket
• Amenities: Shampoo, conditioner, body soap and hairdryers are provided. Towels are charged for: a towel with the logo is 280 yen, a bath towel 700 yen, a towel and bath towel set 900 yen, a wash towel 150 yen, a hairbrush 150 yen and a shower cap 100 yen
• Tattoos: People with tattoos, whatever their size, may not enter. Pets, and photography in the changing rooms and baths, are also prohibited by the rules
• Depth of the bath: About 1 meter. Take care if you are bathing with small children
• Rest areas: A post-bath lounge for bathers only is free to use. The tearoom, glazed on three sides with a view of the Otozure River, is for those ordering food and drink, and use for purposes other than bathing may be restricted when it is busy. You may not bring your own food or drink into the rest room
• Rail service status: On the JR Mine Line, the section between Asa and Nagatoshi has been suspended since the heavy rain of June and July 2023, and replacement buses continue to serve Nagato-Yumoto Station (the timetable was revised in April 2026). If you plan to come by train, check in advance
• Access: About a 15-minute walk from Nagato-Yumoto Station. By bus, get off at the "Nagato Yumoto Onsen Chushajo" stop and walk 5 minutes. By car, about 30 minutes from the Mine IC on the Chugoku Expressway. The address is 2265 Fukawa Yumoto, Nagato City, Yamaguchi Prefecture
• Parking: Onto has no car park of its own, so use the municipal "Nagato Yumoto Onsen Parking" (paid) along National Route 316. On weekdays it is 200 yen for the first 2 hours, then 100 yen per hour, up to a maximum of 1,000 yen (within 24 hours of entering). On Saturdays, Sundays and public holidays it is 200 yen for the first hour, then 100 yen per 30 minutes, up to a maximum of 1,000 yen. From 18:00 to 8:00 the next morning it is 50 yen for the first hour and then 50 yen per hour. Parking for motorcycles is free
• Other day-trip baths in the hot spring town: Haradaya Ryokan charges 500 yen for adults and 300 yen for children (age 4 to elementary school age); Hotel Nagato Harada charges 700 yen for adults and 500 yen for children; Gyokusenkaku charges 1,300 yen for adults and 600 yen for children; and Otanisanso charges 2,500 yen for adults and 1,250 yen for elementary school students
• Time needed: 1 to 2 hours for a bath at Onto and time in the post-bath lounge, or half a day if you also walk to the riverside terrace, the stepping stones and the illuminations
• Avoiding the crowds: Onto shows live information on how busy the men's and women's baths are on its official website. Checking before you set out can cut your waiting time

Information Sources

The spring quality, pH, source temperature, yield, treatment of the water (free-flowing from the source, with minimal heating in winter only), opening hours, bathing fees, prices of the private bathing and premium toji plans, prices of towels and amenities, parking charges, and the depth and size of the bath were confirmed on the "Facility Guide," "Fees," "Spring Quality and Overview" and "Onto Etiquette" pages of the official Onto website. The rules on tattoos, photography and pets are from the terms of use on the same website. Access, the riverside terrace, the stepping stones, the fees at other day-trip baths in the hot spring town, and the replacement bus service on the JR Mine Line are from the official Nagato Yumoto Onsen tourism website. The date Reito closed was confirmed in an article on the official Nagato City website. Details are subject to change, so please check the official information before you set out.