Ito Onsen
伊東温泉
4.2 · 2400 reviews · via Google
Ito Onsen
chloride · Chubu
Hotter than 63% of Japan springs (n=122).
More acidic than 67% of Japan springs (n=121).
Mineral profile
Bar width reflects listing order, not measured concentration.
Suitability
At a glance
Getting there
Easy — under 1km from a station
Cost
Moderate
Crowd level
Popular
About this spring
Ito sits along the eastern shore of the Izu Peninsula, facing the ocean and ranking among Japan's most productive hot spring districts by volume. More than 1,500 individual springs feed the town's supply, together pushing out around 30,000 kiloliters of water each day. Palm-lined avenues, tropical parks, and botanical gardens set the tone here, giving Ito a resort atmosphere that reads as distinctly its own compared to inland onsen destinations.
Highlights
History
The waters at Ito were already in use during the Heian period, though the town drew wider attention at the start of the Edo era for reasons unrelated to bathing.
In 1604, the English navigator William Adams, who had received samurai status from Tokugawa Ieyasu, oversaw the building of Japan's first Western-style sailing ships at Ito's harbor. The shogunate maintained a particular interest in the town from that point forward, and the third Tokugawa shogun gave Ito an official designation as a place of rest and recuperation. Its growth into a mainstream destination accelerated when the Ito railway line opened in 1938, cutting the travel time from Tokyo to a comfortable length. Adams is remembered locally every August at the Anjin Festival.
Local guide
Take the JR Tokaido Line out of Tokyo to Atami, change to the Ito Line, and after twenty-five minutes more you arrive at Ito Station on the edge of the Izu Peninsula. The air is different here even before you step outside. The palm trees along the road to the waterfront were planted to match the subtropical latitude, and the town has a loose, beach-resort feeling that sits oddly alongside traditional onsen culture. In most hot spring destinations the thermal water is the defining feature. In Ito it is just one thing among several, because the earth beneath this peninsula produces spring water in larger quantities than almost anywhere else in Japan.
Thirty-three thousand liters per minute is the figure that gets quoted about Ito's combined spring output, which places it among the highest-volume onsen towns in the country. The water drawn from under the city is a sodium-chloride type, pH 7.8, neutral enough that it causes no particular sensation on entry, no sting, no smell. It sits clear and hot, slightly saline, and warms the skin evenly without the metallic edge you find in iron springs or the faint bite of sulfur springs. After twenty minutes in an Ito bath your skin tends to feel clean in a straightforward way, the chloride working as a mild preservative against heat loss, keeping you warm after you step out.
The Jogasaki Coast, about ten minutes south of town, was formed four thousand years ago when lava flowed from Mount Omuro into the Pacific Ocean and the waves spent the following centuries shaping it into a nine-kilometer stretch of vertical black cliffs, sea caves, and collapsed lava tubes. The coastal trail runs the length of it, and the 48-meter Kadowaki Suspension Bridge crossing one section of the gorge is the kind of thing that makes your legs feel hollow for a moment. Ito is one of the few places where you can hike along UNESCO-recognized volcanic coast in the morning and be in a proper hot spring bath before lunch.
The Tokugawa shogunate used Ito as a rest stop during the Edo period, a pattern that continues in a looser way today: weekend trains from Tokyo fill up early, and by Saturday afternoon the smaller public baths near the station have queues. Come on a Tuesday, walk the cliff trail, eat grilled fish near the pier, soak until the evening train. It is not a complicated place to enjoy.
Mineral chemistry
Water character inferred from mineral type — verify on site.
Sodium chloride springs, essentially natural saltwater baths, are celebrated for their warming and moisturising effects. The salt forms a thin film on the skin that slows moisture evaporation, keeping skin hydrated longer than a freshwater bath.
Those with high blood pressure or heart conditions should consult a doctor before bathing, as the warming effect increases circulation. Avoid immersing open wounds.
Simple thermal springs have lower dissolved mineral content but are valued for the pure therapeutic effect of heat immersion itself — easing muscle tension and improving circulation. Considered the gentlest introduction to hot spring bathing.
Standard precautions apply: avoid bathing within 30 minutes of eating, keep soaks to 10–15 minutes for first-timers, and hydrate before and after.
Similar springs
FREEThe valley occupies the center of Noboribetsu Onsen in Hokkaido. Jigokudani translates as Hell Valley. The crater covers 11 hectares and releases roughly 10,000 tonnes of hot spring water each day. Fumaroles vent steam across the floor of the valley, boiling pools bubble at the surface, and the surrounding cliffs carry heavy mineral staining. A walking path winds through the area in about 20 minutes and is open to all visitors at no cost. It ranks among the most striking landscapes accessible on foot anywhere in Japan.
Dogo Onsen ranks among the oldest hot springs in Japan, with written records documenting its use for more than 1,300 years and oral traditions pointing back considerably further. The landmark Dogo Onsen Honkan is a three-storey wooden bathhouse finished in 1894, widely credited as the inspiration for the bathhouse depicted in Studio Ghibli's Spirited Away. The spring water is mildly alkaline and has long been valued for its ability to soften and smooth the skin.
Beppu is the most geothermally active city in Japan, with more than 2,900 hot spring vents located within the city limits and eight distinct thermal spring zones collectively known as the Beppu Hatto. The variety on offer is wide, ranging from grand hotel bathhouses to modest neighborhood public facilities to the celebrated Hells, a collection of brilliantly colored boiling pools scattered across the city. The Hells run far too hot for bathing, but they draw visitors who come to walk among them and take in the spectacle.
Arima Onsen sits in the hills above Kobe, close to Mount Rokko, and ranks among the oldest hot spring towns in Japan. The town draws visitors for two entirely different spring types that coexist within its compact footprint. Kinsen is the iron-rich golden water that stains surrounding rocks a rusty orange, while ginsen runs clear and carries both carbonation and mild radioactivity. Few other onsen destinations in Japan bring together two such distinct water types within a single small town.
Amenities
Getting there
From Tokyo: JR Tokaido + Ito Line
Gateway: Ito (110 min)
Walk to bathhouse
Total journey: 115 min
Take the JR Tokaido Line from Tokyo to Atami, then transfer to the JR Ito Line to Ito Station. The total journey takes about 110 minutes from Tokyo.
Location & nearby
Ito City, Shizuoka 414-0001
Make a day of it
Pair your soak with these nearby spots.
Park
Monomitsuka Park
0.2km away
Park
Hongo Park
0.3km away
Attraction
Kusumi Onsen Hall Misyamonten Shiba-no-Yu
0.4km away
Attraction
Izubunkyo Manshon
0.7km away
Park
Anjin memorial park
0.7km away
Park
Family
0.8km away
More springs in Chubu
FREENozawa Onsen is a traditional village in Nagano Prefecture that maintains 13 free public bathhouses open to visitors and residents alike. These bathhouses, known as soto-yu, have been overseen by neighborhood cooperatives called yunakama for close to four centuries. The village also contains world-class ski slopes, a pairing that is genuinely uncommon anywhere in the world.
A mountain town in Niigata Prefecture famous for heavy snowfall and a unique sake-infused bath. After a day on the ski slopes, visitors soak in outdoor baths while snow falls silently around them. The town is also the setting of one of Japan's greatest novels.
Japan's highest natural hot spring inn sits at 2,410 meters above sea level on the Murodo Plateau, along the Tateyama Kurobe Alpine Route in Toyama Prefecture. The water is a milky white acidic sulfur spring, fully free-flowing and undiluted, fed by the volcanic Jigokudani crater below. The inn is open only from mid-April to late November, and reaching it is an adventure in its own right.
Common questions
What is the water temperature at Ito Onsen?▾
The water temperature at Ito Onsen ranges up to 68°C (minimum around 25°C).
Is Ito Onsen free to visit?▾
Ito Onsen charges an entrance fee in JPY.
Is Ito Onsen a public or private bath?▾
Ito Onsen is a public bathing spring.
Are tattoos allowed at Ito Onsen?▾
Tattoo policy varies at Ito Onsen. Check ahead of your visit.
What is the nearest station to Ito Onsen?▾
The nearest station to Ito Onsen is Ito Shiyakusho, about 0.1km away.