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Oiso Prince Hotel
forumWhat families say
Rakuten Travel rating 4.45 out of 5 (1,636 reviews). Many guests report thoroughly enjoying the infinity pool and the spa, and families rate the hotel highly as well. The omelets made at the breakfast live kitchen also drew praise. On the other hand, some guests found the rooms small or dated, with one writing that the rooms are very small and that they weren't sure they would call them comfortable.
Categories
Kids Facilities
Crib and bed guard rentals
Crib and bed guard rentals
The hotel has 9 cribs and also lends bed guards for children who are co-sleeping. Because there is a night table between the beds, two beds cannot be placed side by side and pushed together.
- •Cribs cannot be used in some room types.
- •Bed guards are limited in number, so you need to note your request in the message field when booking.
Oiso Long Beach (summer outdoor pools)
Oiso Long Beach (summer outdoor pools)
- calendar_monthSeason:Summer only
A summer-only outdoor leisure pool complex with 7 pools, including a 500-meter lazy river, a wave pool and water slides, plus a pool for children. In 2026 it runs from Saturday, July 4 to Sunday, September 13.
- •Children ages 8 and under must be accompanied by a guardian aged 16 or over.
- •Admission is charged from age 3.
- •Age limits are set as height limits, depending on the facility.
Children's menu
Children's menu
Some restaurants offer a meal menu for children.
- •Meals at the restaurants carry a separate charge from age 3.
Private-hire baths (Private Spa)
Private-hire baths (Private Spa)
There are 2 private-hire baths for families or same-gender groups: FUJI (42 sq m), which looks out over the Pacific Ocean, and OSHIMA (24 sq m), with views across Sagami Bay. Children who are not yet out of diapers are asked to refrain from using the onsen on the 3rd floor, but they may use these private-hire baths.
Kodomo to Issho ni Zekkei Taiken, a spectacular-view experience with children (4th-floor spa floor)
Kodomo to Issho ni Zekkei Taiken, a spectacular-view experience with children (4th-floor spa floor)
- calendar_monthSeason:Seasonal
The 4th-floor spa floor, with its infinity pool and other facilities, is normally for ages 12 and over. This limited-time program, running until Wednesday, March 31, 2027, lets children ages 4 to under 12 use it when accompanied by a guardian.
- •Children cannot use the floor on their own and must always be accompanied by a guardian.
- •As swimwear is required in this area, kids-size swimsuits must be brought from home or purchased at reception.
- •Children wearing a diaper or swim pants cannot enter.
Overview
Oiso Prince Hotel is a resort hotel in Oiso, Kanagawa, about an hour from central Tokyo. Its 305 rooms come in 8 types, and the property has the outdoor pool complex Oiso Long Beach in summer and the onsen and spa facility THERMAL SPA S.WAVE year-round. Children ages 0 to 5 stay free when co-sleeping, and cribs and children's menus are available. Note that children who are not yet out of diapers are asked to refrain from using the onsen, and there is no childcare service or kids' program.
Rooms
All 305 rooms come in 8 types and are non-smoking. The Mountain View Twin (19.8 sq m) sleeps 2, while family options include the Ocean View Twin (28.6 sq m), which sleeps up to 4 with two beds plus an extra bed and a sofa bed; the 60.4 sq m Long Beach Suite, where you can go barefoot; and the Oiso Suite, also 60.4 sq m, for up to 4 guests. Co-sleeping is free for children ages 0 to 5, and children ages 6 and over are not accepted for co-sleeping. There are 9 cribs, though they cannot be used in some room types. Because there is a night table between the beds, two beds cannot be pushed together, but bed guards are available to borrow in limited numbers; note your request in the message field when booking.
Dining
Breakfast is a Japanese and Western buffet, and some restaurants also offer a children's menu. Meals accommodating food allergies can be arranged. Meals at the restaurants carry a separate charge from age 3. A children's rate is set for children ages 6 to under 12 booked on a plan that includes meals; on room-only plans the rate is charged per room, so no children's rate is set.
Baths and Onsen
The onsen floor on the 3rd floor has one open-air bath and one indoor bath for each gender, fed by the Oiso Onsen source, and the 8.5-meter open-air bath looks out over the Pacific Ocean. Children who are not yet out of diapers are asked to refrain from using the onsen, but there are 2 private-hire baths (FUJI and OSHIMA) for families or same-gender groups, and children who are not yet out of diapers may use these. THERMAL SPA S.WAVE is presented as an adult-oriented spa facility, and the 4th-floor spa floor, with a swimwear-only infinity pool and saunas, is normally for ages 12 and over. Until March 31, 2027, the hotel is running a limited-time experience, Kodomo to Issho ni Zekkei Taiken (taking in the spectacular view together with your children), which lets children ages 4 to under 12 use the floor when accompanied by a guardian. Kids-size rental swimsuits are not available for this experience, and children wearing diapers or swim pants cannot enter.
Family-friendly features
In summer, the outdoor pool complex Oiso Long Beach is open, running from July 4 to September 13 in 2026. It has 7 pools, including a 500-meter lazy river, a wave pool and water slides, along with a pool for children. Children ages 8 and under must be accompanied by a guardian aged 16 or over, and admission is charged from age 3. Age limits are set as height limits, depending on the facility. There is no childcare service, kids' program or babysitting service.
Access
By train, it is about 7 minutes by taxi from Oiso Station on the Tokaido Main Line (about 1,300 yen), or about 5 minutes by taxi from Ninomiya Station (about 1,000 yen). A public bus also runs between JR Oiso Station and the hotel (12 minutes and 200 yen under normal conditions). By car, it is 2 km from Oiso I.C. on the Odawara-Atsugi Road, reached via Atsugi I.C. on the Tomei Expressway (5 minutes under normal conditions), or 1 minute from Oiso-nishi I.C. on the Seisho Bypass. Parking has 200 spaces, and staying guests pay 1,000 yen per night.
Access & Information
| location_onAddress | 546 Kokufu Hongo, Oiso-machi, Naka-gun, Kanagawa 259-0193 |
|---|---|
| directions_carAccess | Oiso Station on the JR Tokaido Main Line. By car, take the Tomei Expressway to Atsugi I.C., then the Odawara-Atsugi Road to Oiso I.C., and continue 2 km. |
| trainNearest station | Oiso Station |
| local_parkingParking | Parking is available. A parking fee of 1,000 yen (tax included) applies per car per night. |
| callPhone | +81-463-61-1111 |
| paymentsCards | VISA, JCB, American Express, Diners Club, UC, DC, NICOS, Mastercard, Saison |
| languageOfficial site | https://www.princehotels.co.jp/oiso/open_in_new |
Reference price as of August 28, 2026 (stay date 2026-09-19). Please check the booking site for actual rates.
Frequently Asked Questions
Can children who are not yet out of diapers use the communal bath or the spa?
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Guests wearing diapers are asked to refrain from using the onsen. On the 4th-floor spa floor as well, children wearing diapers or swim pants are asked to refrain from entering.
Are there meals for children?
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Some restaurants offer a children's menu.
Can children use the pools on their own?
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To prevent accidents, children ages 8 and under must be accompanied by a guardian aged 16 or over. Children cannot use the pools on their own.
Can children under 12 use the spa (THERMAL SPA S.WAVE)?
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The spa floor is normally for ages 12 and over, but for a limited time the hotel is running Kodomo to Issho ni Zekkei Taiken (a spectacular-view experience to enjoy with your children), which lets children ages 4 and over use it when accompanied by a guardian. Without a guardian, children under 12 may use only the 3rd-floor onsen floor.
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Information on this page was compiled by directly consulting Official website, Rakuten Travel, Ikyu.com (a Japanese booking site), Jalan (last verified: August 2026). Prices, availability and seasonal operations change — please check each booking site for the latest information.
We take care to keep information accurate, but always confirm the latest details on the hotel's official site and booking sites before you book or visit.