Ito Onsen is a seaside hot spring area on the east coast of the Izu Peninsula in Ito City, Shizuoka Prefecture, facing Sagami Bay. Its biggest feature is abundant hot spring water: the city has many sources and is known as an area with a high total flow rate. The spring quality is mainly simple hot spring, with little irritation and an easy feel, making it welcoming for first-time visitors and families. About 1 hour 40 minutes from Tokyo by limited express, it suits both overnight hot spring trips and weekend getaways that combine seaside walks and nearby sightseeing.

What makes Ito appealing is that it is not a quiet hidden hot spring, but a destination chosen for its overall balance of sea, baths, sightseeing, and food. Beyond the springs, Ito offers distinctive highlights such as Tokaikan, a wooden hot spring inn building from the early Showa period; historical ties to William Adams, who is said to have built Japan’s first full-scale Western-style sailing ship here in the early Edo period; and scenic spots created by volcanic activity, including Oomuroyama and the Jogasaki Coast. This article organizes Ito Onsen’s features, spring qualities, main sights, seafood, seasons, and access based on official information from Ito City and the Ito Tourism Association.

What kind of hot spring destination is Ito Onsen?

Ito Onsen spreads across a hot spring district in the central part of the east coast of the Izu Peninsula, in a city area open toward Sagami Bay. Inns, hotels, and day-use facilities line the seaside, and the distance from the station to the hot spring district and coast is relatively short. Unlike hot spring areas tucked away in the mountains, Ito makes it easy to build a straightforward trip centered on seeing the sea, bathing, and enjoying seafood.

Another strength of Ito is its volume of hot spring water. The city has many sources, and it is often introduced as an area with a large total flow of spring water per minute. Exact output and source counts vary by year and statistics, so the latest numbers should be checked in official information from Ito City or the Ito Tourism Association, but the fact that hot spring water is plentiful is one of the defining reasons Ito has so many lodging choices and easy day-use bathing options.

Looking at its history, Ito has long been a hot spring village, but in the early Edo period it also left its mark as a place linked to a foreign figure. William Adams, the Englishman who served Tokugawa Ieyasu and was known in Japan as Miura Anjin, is said to have built Japan’s first full-scale Western-style sailing ship here, and that connection continues today through events such as Anjin Festival. Beneath the image of a seaside resort, Ito Onsen has layers of bathing culture and history.

Spring quality: mostly simple hot springs, easy to enjoy

Ito Onsen is centered on simple hot spring water, though some facilities are said to also draw on chloride springs and other types. Rather than a hot spring destination known for strong sulfur aroma or cloudy water, it is characterized by clear, lightly stimulating water with a gentle feel on the skin. Because it is easy to get used to, it is also welcoming for people new to hot springs and for families.

Simple hot springs are mild, but that does not mean long bathing is always better. If you stay in the bath too long, even an easy-to-enter hot spring can lead to overheating or fatigue. When combining bathing with seaside walks and sightseeing, it is better to limit bath time and take breaks for hydration and rest. Spring names and ingredients vary by source and facility, so if you want exact details, check the on-site hot spring analysis sheet displayed at each facility. For a broader beginner-friendly overview of spring types, see Hot Spring Types for Beginners. If you want to choose a bath with fresh source water, including whether it is diluted or reheated, read What Is Gensen Kakenagashi? as well.

Main sights

Ito’s highlights fall broadly into three categories: historic buildings in the hot spring district, seaside leisure, and volcanic landscapes a little farther out. To make planning easier, here is a quick summary of representative spots so you can divide your time between baths and sightseeing.

Because opening hours, operation status, and access details can change, please check the latest official information from each facility or the Ito Tourism Association before visiting.

Tokaikan

If you want to experience the history and architecture typical of Ito’s hot spring district, Tokaikan is a must. Built in 1928, it is a wooden hot spring inn building that no longer serves as a lodging but is now open to the public as a sightseeing and cultural facility. Its three-story wooden design, which reflects skilled craftsmanship, adds a different dimension to a trip compared with modern bathing facilities.

Since it stands along the Matsukawa River, it is easy to combine with a riverside walk. Day-use bathing and events may be offered at times, but the contents and hours vary by season, so it is best to confirm in advance. If you are interested in the architecture and design of a traditional hot spring inn, Ito lets you enjoy not only the bath itself but also the building.

Ito Orange Beach and Ito Marine Town

If you want an easy-to-understand seaside atmosphere, Ito Orange Beach near the city center is a good choice. You can stroll while looking out at the sea, and it is close to the hot spring district. However, because the beach gets busier during swimming season, mornings or the off-season may feel calmer.

For a casual seaside complex, Ito Marine Town along the national road is convenient. Dining, shopping, and day-use bathing can all be done in one place, making it especially handy for car-based trips. Rather than a place to experience hot spring nostalgia itself, it works well as a stop where you can feel Ito’s practical seaside charm during a trip.

Oomuroyama and Jogasaki Coast

If you go a little farther, Oomuroyama and the Jogasaki Coast toward Izu Kogen show scenery unique to Ito. Oomuroyama is a gentle grassy mountain created by volcanic activity, where you can ride the ropeway to the summit and walk around the crater rim on the so-called crater-loop trail. It is also known for the annual mountain burning event, but dates and operations depend on weather and season, so be sure to check the latest official information.

The Jogasaki Coast is a cliff-lined shoreline formed by lava flowing from the eruption of Oomuroyama. From suspension bridges and walking trails, you can get close to dramatic coastal rock formations. It contrasts sharply with the calm beach atmosphere of swimming areas, showing the wide range of expressions the sea has even within Ito. Since both require travel from the central hot spring district, it is usually less hectic to limit yourself to one if you are on a 1-night, 2-day trip.

Food highlights: seafood from Sagami Bay

Because Ito faces Sagami Bay, it is an easy place to enjoy seafood. From kinmedai to kaisen-don, local fish, and dried fish, there are many straightforward specialties, and the dinner at a hot spring inn can greatly affect overall trip satisfaction. As a seaside hot spring destination, Ito makes it easy to combine bathing and food into one trip.

That is why, when choosing accommodation, dinner matters just as much as the bath. Whether you choose an inn with sea views or one known for excellent cuisine can change the impression of the trip significantly. Around the hot spring district and the port, there are also many restaurants and dried-fish shops, so you can enjoy local fish and dried fish in town in addition to your inn meals.

Seasonal and purpose-based ways to enjoy Ito

Ito is easy to visit year-round, but the best time changes depending on what you want to focus on. If you decide your purpose first, choosing accommodations and planning activities becomes much easier.

Summer is the most obvious choice if you want to enjoy the sea, but crowds also increase. If your main focus is hot springs and strolling around town, spring and autumn are better because the weather is calmer and it is easier to balance meals and walks. Even in winter, the area is relatively comfortable and works well as a hot spring trip with ocean views. If you decide first whether you want beach time or hot spring relaxation, it becomes much easier to choose.

Who is Ito Onsen best for?

Ito Onsen is ideal for travelers who value good access, want to stay at a hot spring with abundant water and an easy feel, or want to enjoy hot springs together with seaside sightseeing and seafood. Because it is centered on simple hot springs with little character-heavy punch, it is also easy for beginners and families to plan.

On the other hand, if you are looking for a strong sulfur smell or cloudy water with a more distinctive hot spring character, it may feel a little subdued. Ito is better understood as a destination chosen for overall balance rather than for intense spring character. If you want to compare it with other places along Izu and Sagami Bay, it has a different feel from the urban resort of Atami Onsen or the calm atmosphere of Shuzenji Onsen with its temples and bamboo groves, so choose according to your travel purpose.

Access

The main gateway to Ito Onsen is Ito Station on the JR Ito Line. From Tokyo, the limited express Odoriko that runs directly on the JR Tokaido and Ito lines is convenient. The ride from Tokyo Station is said to take about 1 hour 40 minutes, making it a realistic weekend-trip destination. Since the station is close to the hot spring district and the coast, rail travel alone is enough if you plan to stay mainly in the hot spring area. Travel time and schedules vary by season and train, so please check the latest information from the railway company.

You can also reach it by car, which is convenient if you want to visit farther spots such as Oomuroyama and the Jogasaki Coast. However, traffic and parking can become crowded during holiday periods and weekends. If you are staying mainly around the hot spring district, public transit works well; if you want to reach scenic spots in the wider area, a car may be better. Choose your transportation based on your main purpose. If you want to search for inns or day-use bathing facilities by area or budget, you can narrow them down from the Facilities List or Search Page. For differences between lodging and day-use bath types, see Types of Japanese Bath Facilities.

Frequently asked questions

What is the spring quality of Ito Onsen?

It is mainly simple hot spring water, though some facilities also offer chloride springs and other types. The water is clear, mildly stimulating, and gentle on the skin, making it especially easy for beginners to enjoy. Because spring names and ingredients vary by source and facility, check the hot spring analysis sheet posted at each facility if you want exact details.

How long does it take to get to Ito from Tokyo?

By the limited express Odoriko, which runs directly on the JR Tokaido and Ito lines, the journey from Tokyo Station takes about 1 hour 40 minutes. It is realistic even for a weekend trip, and since Ito Station is close to the hot spring district and the coast, staying around the hot spring town works well even by train alone. Travel times and timetables vary by season and train, so please check the latest information from the railway company.

What kind of facility is Tokaikan?

It is a wooden hot spring inn building built in 1928. After its role as an inn ended, it was opened to the public as a sightseeing and cultural facility. It stands along the Matsukawa River, and its three-story wooden design is one of its highlights. The contents open to the public, and whether day-use bathing or events are available, may change by season, so check the latest information before visiting.

Are Oomuroyama and the Jogasaki Coast close to Ito Onsen?

Both are in the Izu Kogen area in southern Ito, so travel from the central hot spring district is required. Oomuroyama is known for the ropeway and crater-rim walk, while the Jogasaki Coast is known for lava cliffs and suspension bridges. If you are on a 1-night, 2-day trip, it is less hectic to choose one of them and combine it with a walk around the hot spring district. Ropeway operations and the mountain burning schedule depend on weather and season, so check official information.

What should I eat in Ito?

Seafood that takes advantage of the location facing Sagami Bay is the main draw, and kinmedai, kaisen-don, local fish, and dried fish are easy-to-recognize specialties. Since dinner at a hot spring inn directly affects trip satisfaction, it is a good idea to check the meal contents when choosing lodging. There are also many restaurants and dried-fish shops around the hot spring district and port.

Summary

Ito Onsen is a hot spring destination in Ito City, Shizuoka Prefecture, combining abundant spring water, easy-to-enjoy simple hot springs, a seaside location facing Sagami Bay, and the convenience of being about 1 hour 40 minutes from Tokyo by limited express. Rather than choosing it for the strength of the bath alone, its appeal becomes clear when you see it as a place to enjoy sea, hot springs, sightseeing, and food together.

By adding one or two Ito-specific elements to your itinerary, such as Tokaikan with its early Showa wooden architecture, the history tied to Anjin, volcanic landscapes like Oomuroyama and the Jogasaki Coast, and seafood from Sagami Bay, you can create a trip that feels distinctly like Ito. If you decide in advance whether you want to focus on beach activities or on hot spring relaxation, it becomes one of the easiest destinations to choose for a weekend hot spring trip.

Sources

• Ito Tourism Association
• Ito City