Disclosure: Some links in this article are affiliate links. If you book through them, I may earn a small commission at no extra cost to you. Every fare and rule below comes from Odakyu, Hakone Tozan Bus, the Japan Tourism Agency or the Hakone facilities’ own websites (several only in Japanese), checked on October 9, 2026.

Dollar amounts are approximate at $1 ≈ ¥158 (October 2026). You pay in yen.

Hakone Ryokan With a Private Onsen for Families (Diaper & Tattoo Rules)

Hakone is the classic onsen trip from Tokyo, and for parents it comes with two questions that travel forums answer in opposite ways: can my child in diapers go in the hot spring, and what if someone in our family has a tattoo?

The short version: in most shared onsen baths, no and usually no. In a private bath, both stop being a problem. That’s why so many families pick a ryokan with a bath in the room or a private bath you can book.

This guide covers getting to Hakone with kids, the bath rules (with the official sources), and what to ask a ryokan before you book.

Quick answer

Getting to Hakone with kids

Romancecar from Shinjuku

Odakyu’s Romancecar limited express runs from Shinjuku to Hakone-Yumoto in about 80 minutes. All seats are reserved, and the trains have restrooms. The regular express takes about 2 hours with no guaranteed seat, which is a long time to stand holding a toddler. Romancecar page

You need two things to ride: a regular ticket (or a pass like the Hakone Freepass) plus a Romancecar limited express ticket.

Children under 6: free if they sit on your lap. If you want a seat for your toddler, Odakyu says you need a child limited express ticket and a child regular ticket for them, the same as for a 6-year-old.

Luggage: depends on the train. The GSE has space for large bags and under the seats; the EXEα has a dedicated suitcase area; others have overhead racks. If you miss your train, you can’t change or refund the ticket after departure, so build in time at Shinjuku.

The Hakone Freepass

The Hakone Freepass covers a round trip between Shinjuku and Odawara on regular Odakyu trains, plus unlimited rides in Hakone on eight kinds of transport: the Hakone Tozan Train, the cable car, the Hakone Ropeway, the Lake Ashi sightseeing cruise (the “pirate ships”), and designated Hakone Tozan, sightseeing, Odakyu Highway and Tokai bus routes. It also gets you discounts at about 70 facilities. Hakone Freepass

Children under 6 don’t need a ticket. The Romancecar ticket is always extra.

Family of four: the real total

2 adults, a 6-year-old and a 2-year-old, Shinjuku round trip by Romancecar, 2-day Freepass:

If you’d rather give the 2-year-old a Romancecar seat, add a child Freepass and two child Romancecar tickets: ¥2,800 (≈$18) more.

Paper, Odakyu’s app, or Klook?

• Paper: buy at the Odakyu Sightseeing Service Center or ticket machines at Shinjuku. With small kids, this is the least fiddly option.
• Odakyu’s digital ticket (EMot): you can buy up to four passes on one phone with the “For Group” option. At the gate, your companions scan through first and you go last, and the group must travel together.
• Klook: Odakyu sells the Digital Hakone Freepass through Klook as an official partner, and the ticket opens in Odakyu’s EMot system. It’s fully refundable until 2:59 a.m. on your first day. The catch, per Odakyu’s terms: every user needs their own smartphone. That works if your children are under 6 (no ticket needed) or old enough to carry a phone. Klook Freepass terms

Onsen rules for families

Children in diapers

There’s no national law that spells this out. It’s a facility rule, and in Hakone you’ll see it in writing:

• The Prince Hakone Lake Ashinoko lists it in its onsen rules: “Guests using diapers can NOT use onsen.” Hotel onsen information
• Hakone Kowakien Yunessun, a big family spa, says that in its hot spring area (Mori no Yu), children who aren’t out of diapers can’t use the baths. They can come into the washing area, or the family can use a private family bath instead. In its swimsuit area (Yunessun), children can join in if they wear swim diapers under their swimsuit, sold in the on-site shop. Yunessun FAQ (Japanese)

So for a baby or toddler in diapers, your options are:

1. A private bath at your ryokan (kashikiri or in-room), where your family’s rules apply
2. A swimsuit spa that accepts swim diapers
3. Washing area only, while one parent bathes and the other waits outside. That’s the “one parent at a time” approach families on Reddit describe.

Which bath can a child use?

Young children usually go into the bath with either parent. The age at which a child can no longer go into the opposite sex’s bath is set locally. In Tokyo, for example, the rule is age 7 and up (it used to be 10) (Tokyo health center briefing, Japanese). Hakone is in Kanagawa Prefecture, and many ryokan set their own rules, so if Dad will bathe with a daughter, ask the ryokan.

Bath etiquette, the short version

From The Prince Hakone’s guide to bathing:

• Wash and rinse off all soap before you get in.
• No towels in the water, and no washing hair or clothes in the tub.
• Enter slowly, no splashing, no swimming. For kids, that’s the hard one.
• No swimsuits in the onsen.
• Dry off before going back into the changing room.
• No phones or photos in the bath or changing room.

Prince Hotels guide to bathing in Japan

Tattoos

Japan’s Tourism Agency sent guidance to the ryokan and onsen associations in 2016. It says that refusing someone only because they have a tattoo isn’t appropriate, that tattoos are not a hygiene problem, and it lists ways facilities can handle them:

1. Cover the tattoo with a sticker or patch; a small (palm-sized) tattoo may need nothing at all
2. Suggest bathing at times when fewer families are in the bath
3. Offer a private bath (kashikiri), or a room with its own bath

Japan Tourism Agency notice (Japanese, posted by Kawasaki City)

That’s guidance, not a law, and each facility still decides. In Hakone you’ll see the whole range:

• The Prince Hakone Lake Ashinoko: tattooed guests can’t use the onsen.
• Yunessun: tattoos (including stickers and paint) are refused in principle. In the swimsuit area, a rash guard that covers them is enough. In the hot spring area, you can bathe only if two of Yunessun’s paid cover stickers cover the tattoo completely; otherwise, book one of its 8 private baths (from ¥7,000 (≈$44) for 2 hours).

For a parent with a tattoo, the simplest fix is the Tourism Agency’s own third option: a ryokan where the family bath is private.

What “private onsen” means at a ryokan

You’ll see three kinds of baths on Japanese ryokan listings:

A room with its own open-air bath costs more, but with a baby you can bathe whenever the baby sleeps or wakes. One Reddit thread put it well: a parent planning Hakone with an 8-month-old and a tattoo was told to “use a Japanese website for searches like this,” because Japanese booking sites let you filter for these features.

Questions to ask the ryokan before you book

Every ryokan sets its own rules, so ask (by email is fine):

1. Is the private bath free or charged, how long is a slot, and do we book it in advance or on arrival?
2. Can our child in diapers use the private bath? Most will say yes, but ask.
3. Tattoos: OK in the private bath? Covered in the shared bath?
4. Dinner: in the room, in a private dining room, or in a shared hall? What’s the earliest dinner time? Ryokan dinners are often long multi-course meals served at set times, which matters with a toddler.
5. Children’s meals: do they offer a kids’ meal, a smaller portion, or nothing for toddlers?
6. Child pricing: Japanese ryokan usually price children in tiers: elementary school age, then preschoolers with meals and futon, meals only, futon only, or neither (sharing a parent’s futon, called soine). The price for each tier is up to the ryokan.
7. Futons and beds: futons on tatami (a toddler can’t fall out of bed) or Western beds?
8. Strollers and stairs: is there an elevator, and how far is the room from the entrance?

Luggage: travel light up the mountain

Hakone means steep streets, small mountain trains and stairs, which is not where you want two suitcases and a stroller.

Hakone Carry Service (station to ryokan)

Drop bags at the Hakone Carry Service counter inside Hakone-Yumoto Station and they go to your ryokan, if it’s a partner property (check the list on the official page). Hakone Carry Service (Japanese)

Price per bag, one way: regular (up to 140 cm total, 15 kg) ¥1,500 (≈$9); large (up to 200 cm, 30 kg) ¥2,500 (≈$16). Strollers aren’t accepted, nor are mobile batteries, valuables or fragile items. Typhoons and snow can stop the service.

Or send bags from Tokyo the day before

Yamato’s luggage delivery from Tokyo to Hakone arrives the next day, so send big bags from your Tokyo hotel the day before you leave and ride the Romancecar with a day bag and the stroller. My luggage forwarding guide has the cutoff times and how to fill in the slip.

FAQ from parents

“Our toddler is still in diapers. Can we use the onsen at all?” Not the shared baths, in most places; Hakone facilities state it in writing. Book a ryokan with a private or in-room bath, or try a swimsuit spa that allows swim diapers.

“I have a tattoo. Will I be turned away?” At some places, yes. Japan’s Tourism Agency tells facilities that refusing someone for a tattoo alone isn’t appropriate, and suggests cover stickers, quiet times or private baths, but each facility decides. A private bath avoids the question.

“Is the Hakone Freepass worth it for a family?” If you ride the ropeway, cruise and buses, usually yes; for our example family, two days plus the round trip is ¥21,800 (≈$138). Children under 6 ride free.

“Can my 2-year-old sit on my lap on the Romancecar?” Yes, for free. A separate seat needs a child Romancecar ticket and a child regular ticket.

“Should we visit the onsen one parent at a time?” That’s the usual workaround in shared baths: one parent bathes while the other looks after the child. A private bath lets the whole family go in together.

Before you go: Hakone checklist

1. Book a ryokan with a private or in-room bath if anyone is in diapers or has a tattoo.
2. Email the ryokan the eight questions above, especially dinner time and child pricing.
3. Reserve Romancecar seats and decide whether your toddler rides on a lap.
4. Choose your Freepass format: paper, Odakyu’s For Group digital ticket, or Klook (a phone for every ticket holder).
5. Plan luggage: Yamato from Tokyo the day before, or the Carry Service from Hakone-Yumoto by noon.
6. Pack swim diapers if you might visit a swimsuit spa, and a rash guard for covering tattoos.
7. Teach the kids three rules: wash first, no towels in the water, no swimming.

Fares, times and rules checked against official Odakyu, Hakone Tozan Bus, Japan Tourism Agency, Tokyo Metropolitan Government, Prince Hotels and Yunessun pages on October 9, 2026. Bath rules differ between facilities, so confirm with your ryokan.