Bathing is more than just washing in Japan. It is part of the culture, a time to relax and refresh both the body and the mind. You will see this clearly when you visit a sento (public bath) or onsen (hot spring). While both involve soaking in a warm bath, they are different in many ways.
In this guide, I will explain the differences between sento and onsen, share my own experience, and help you decide which one to try. You can also read more on the Japan National Tourism Organization (JNTO) website, which offers great tips about Japanese bathing culture.
What Is a Sento?
A sento is a type of public bathhouse that became popular in big cities like Tokyo after World War II. These are not natural hot springs but heated tap water. In the past, many homes did not have bathtubs, so sento was a place where locals gathered.
Most sento are in neighborhoods and used by local people. You pay a small fee, usually around 500 yen. Inside, you will find a changing room and a large bath area, sometimes with different types of tubs.
I used to go to a small sento near my grandmother’s house in Shitamachi Tokyo. It was very simple, but the old wooden lockers and the smell of soap always made me feel nostalgic.
What Is an Onsen?
An onsen is a natural hot spring that comes from underground. Japan has many volcanoes, so there are thousands of onsen around the country. The water contains minerals like sulfur or iron, and each onsen has a different health benefit.
To be called an onsen by law, the water must be naturally heated and contain a certain amount of minerals. Onsen are usually found in the countryside, near mountains or rivers. Many are part of ryokan (traditional inns), and include outdoor baths called rotenburo.
One of my favorite onsen trips was in Kusatsu, Gunma. The water was hot and slightly acidic, and I felt my skin become very smooth after.
Main Differences Between Sento and Onsen
| Feature | Sento | Onsen |
|---|---|---|
| Water source | Heated tap water | Natural hot spring |
| Location | Cities and towns | Countryside, resort areas |
| Price | Around 500 yen | Varies (usually 700–2000 yen) |
| Mineral content | None | Rich in minerals |
| Purpose | Daily hygiene and community | Relaxation and healing |
| Atmosphere | Local and simple | Scenic and traditional |
Both can be enjoyable, but they offer different experiences.
Etiquette to Remember
Whether you visit a sento or onsen, proper manners are important:
- Wash your body first at the shower area before entering the bath
- Don’t put towels in the water
- Don’t swim or splash
- Tie up long hair
- Keep your voice low
Tattoos can be a problem. Some places do not allow them, but this is changing slowly. Contact the facility first to check the rules.
Popular Onsen Destinations
If you want to try a famous onsen area, here are the 3 top onsen in Japan
Arima Onsen
Arima Onsen, located in Hyogo Prefecture, is one of Japan's oldest and most famous hot spring resorts. Known for its unique mineral-rich waters, including the golden and silver springs, it offers a relaxing experience. Visitors can enjoy traditional ryokan stays and scenic views of the surrounding mountains.
Kusatsu Onsen
Kusatsu Onsen, located in Gunma Prefecture, is one of Japan’s top three onsens, alongside Gero Onsen and Arima Onsen. Known for its high-quality sulfuric waters, Kusatsu is famous for its healing properties. Visitors can enjoy the iconic Yubatake (hot water field), soak in public baths, and relax in traditional ryokan.
Gero Onsen
Gero Onsen in Gifu Prefecture is one of Japan’s most renowned hot spring resorts, offering healing mineral-rich waters in a scenic setting. Visitors can enjoy public baths, traditional ryokan, and outdoor onsens, making it the perfect place for relaxation and experiencing authentic Japanese onsen culture.
Other popular onsen
- Hakone (Kanagawa): Near Tokyo, famous for its views of Mt. Fuji
- Beppu (Oita): Known for its steam and variety of hot springs
- Noboribetsu (Hokkaido): Rich mineral water and beautiful forests
- Yufuin (Oita): Quiet, artistic town with relaxing baths
Each town has its own charm and bathing culture.
Sento Is Still Part of Daily Life
While onsen is more for travel, sento is still part of life for many Japanese people. Even today, some people visit sento after work or school to relax. Some modern sento now include sauna, cold baths, and jet massage tubs.
If you want to try a local experience, I recommend visiting a sento in the evening. It shows a different side of Japan that most tourists don’t see.
Final Dip
Bathing is a special part of Japanese culture. Whether you choose a simple sento or a luxurious onsen, the experience is both relaxing and meaningful. For me, soaking in a bath after a long day always brings peace. I hope you will enjoy it too.
