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forumWhat families say
Rakuten Travel rating 4.05 out of 5 (3,010 reviews). Guests praise the ocean views over Nojimazaki Lighthouse and the Pacific, the seafood grilled over a net with the seasonal-vegetable buffet, and the Shirahama Nojima Onsen communal bath. Families also rate the summer outdoor pool, the touches for guests traveling with babies such as the baby bed and baby bath, and the half-price plans for children.
Categories
Kids Facilities
Summer-only outdoor pool (free for staying guests)
Summer-only outdoor pool (free for staying guests)
- calendar_monthSeason:Summer only
- paymentsPrice:Free for guests
An outdoor pool that operates in summer only and is free for staying guests. It is ideal for a family trip during the summer holidays, with water play in a setting that looks out to the sea and the lighthouse.
- •Open in summer only and free for staying guests; in 2026 it runs from July 18 to August 22
Kudori no Yu, the Shirahama Nojima Onsen communal bath
Kudori no Yu, the Shirahama Nojima Onsen communal bath
A communal bath fed by the hotel's own Shirahama Nojima Onsen source. The sodium chloride spring water has a high salt content, has long been handed down as a bath of beauty, and is praised for leaving skin feeling smooth. The large rocks surrounding the bath have been known since ancient times as Kudori no Iwa and treasured by the local area. The changing room has a baby bed, and a baby bath and assist chairs are among the touches provided for families with babies.
- •Bathing hours are 3 p.m. to midnight and 5:30 to 9:30 the following morning, when the men's and women's baths are swapped. There is no open-air bath or sauna
- •The changing room has a baby bed, and a baby bath, a children's bath chair and assist chairs are provided, with baby items also lent from the front desk. No explicit age restriction is published, and the facilities are set up to welcome families with babies
- •The bath is on the first floor and has no windows, and reaching it involves 18 steps with handrails. Bring your towels from your room
- •Guests with tattoos may not use the bath
Seafood grilled over a net, a seasonal-vegetable buffet and the summer kids' corner
Seafood grilled over a net, a seasonal-vegetable buffet and the summer kids' corner
Dinner is Nankaiso's signature seafood grilled over a net together with a seasonal-vegetable buffet, and guests enjoy dishes they can watch, make and taste, such as freshly fried tempura and kaisen-don (a seafood rice bowl). In summer only, a kids' corner gathers dishes children love, including French fries and yakisoba fried noodles. Children's chairs and tableware are available at the venue.
- •Children's chairs and tableware are available at the buffet venue. Some soft drinks and alcoholic drinks are included in the buffet
- •Dinner starts at 6 p.m., with two seatings on busy days, and the breakfast buffet runs from 7 to 9 a.m.
Overview
Hotel Nankaiso is an ocean-view resort hotel in Shirahama, at the southern tip of the Boso Peninsula, looking out over Nojimazaki Lighthouse and the Pacific Ocean. Its communal bath, Kudori no Yu, is fed by Shirahama Nojima Onsen, a sodium chloride spring handed down as a bath of beauty, and the changing room has a baby bed, a baby bath and assist chairs, all welcome touches for families with babies. The summer-only outdoor pool is free for staying guests, and the dinner buffet of seafood grilled over a net and seasonal vegetables adds a kids' corner that children love. With half-price plans for children and connecting rooms, it suits a family trip well.
Hotel Nankaiso is an ocean-view resort hotel in Shirahama, at the southern tip of the Boso Peninsula in Minamiboso, Chiba, looking out over Nojimazaki Lighthouse and the Pacific Ocean. Operated by the HMI Hotel Group, it has 99 rooms, and families praise its dinner of seafood grilled over a net with a seasonal-vegetable buffet, the Shirahama Nojima Onsen communal bath, and the summer outdoor pool.
Kudori no Yu, the Communal Bath Fed by Shirahama Nojima Onsen
The communal bath draws on the hotel's own Shirahama Nojima Onsen source, a sodium chloride spring with a high salt content. It has long been handed down as a bath of beauty, and guests praise the way it leaves skin feeling smooth. Its listed bathing benefits include recovery from fatigue, muscle pain and neuralgia. Bathing hours are 3 p.m. to midnight and 5:30 to 9:30 the following morning, when the men's and women's baths are swapped. The bath is on the first floor and has no windows; reaching it involves 18 steps, and each bath has handrails and assist chairs. There is no open-air bath or sauna. The changing room has a baby bed, and a baby bath, a children's bath chair and assist chairs are provided. The front desk also lends baby items, so families with babies can bathe with peace of mind. No explicit age restriction is published, so please confirm with the hotel. Guests with tattoos may not use the bath.
Summer-Only Outdoor Pool
The outdoor pool operates in summer only and is free for staying guests; in 2026 it runs from July 18 to August 22. It is ideal for a family trip during the summer holidays, and the dinner buffet adds a summer-only kids' corner gathering dishes children love, such as French fries and yakisoba fried noodles. Half-price accommodation plans for children are also available.
Seafood Grilled Over a Net and a Seasonal-Vegetable Buffet
Dinner is Nankaiso's signature combination of seafood grilled over a net and a seasonal-vegetable buffet. Guests enjoy dishes they can watch, make and taste: freshly fried tempura, seafood grilled right at the table, and kaisen-don (a seafood rice bowl) built with the toppings you choose. The buffet venue has children's chairs and tableware, and some soft drinks and alcoholic drinks are included in the buffet. Dinner starts at 6 p.m., with two seatings on busy days, and the breakfast buffet runs from 7 to 9 a.m.
Rooms and Facilities
Guest rooms look out over Nojimazaki Lighthouse and the Pacific Ocean and come in a wide range of types, including Japanese-style tatami rooms, Japanese-Western rooms, Western-style twins, triples and Fours, and connecting rooms. All rooms are non-smoking. The connecting rooms, which take up to 7 guests, are well suited to families with young children and to groups. On site there are rental bicycles, including children's bicycles, a coin laundry, karaoke, a beauty salon and a shop. Pets cannot stay, though there is a hotel exclusively for small dogs nearby. Bed guards are also available to borrow for guest rooms; quantities are limited, so please ask early if you would like one.
This page is compiled from information on the official website and Rakuten Travel. Please check the official website or Rakuten Travel for the latest details.
Access & Information
| location_onAddress | 623-13 Shirahama, Shirahama-cho, Minamiboso, Chiba 295-0102 |
|---|---|
| directions_carAccess | A free shuttle bus runs from Tateyama Station on the JR Uchibo Line, departing the station at 2:40 p.m. and requiring an advance reservation. Alternatively, take the JR Kanto bus bound for Awa-Shirahama, get off at the Nojimazaki Todaiguchi stop and walk about 5 minutes. By car, it is about 35 minutes from Tomiura IC on the Tateyama Expressway. |
| trainNearest station | Tateyama Station |
| local_parkingParking | Free for cars and motorcycles. Buses are charged 1,000 yen per vehicle per night; a space is not reserved exclusively for you and is used as needed. |
| callPhone | +81-470-38-3500 |
| paymentsCards | VISA, JCB, American Express, Diners Club, UC, DC, NICOS, UFJ Card, Mastercard, Saison |
| languageOfficial site | https://www.hmihotelgroup.com/ryokan-nankaiso/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
What baby and children's items can we borrow at Hotel Nankaiso?
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A baby bath and a children's bath chair are available to borrow, along with humidifiers, air purifiers, bed guards and wheelchairs. Quantities are limited, so please ask early if you would like to use one. Yukata in larger and smaller sizes are laid out in the elevator hall on each floor, and children's yukata can be chosen from there.
Is the communal bath suitable for babies and young children?
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The changing room has a baby bed, and a baby bath, a children's bath chair and assist chairs are provided, with baby items also lent from the front desk. No explicit age restriction is published, so please confirm with the hotel. The bath is open from 3 p.m. to midnight and from 5:30 to 9:30 the next morning, when the men's and women's baths are swapped; there is no open-air bath or sauna, reaching the bath involves 18 steps with handrails, and towels should be brought from your room.
Is there a pool the children can use?
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There is an outdoor pool that is free for staying guests and operates in summer only; in 2026 it runs from July 18 to August 22. A children's pool is available as well.
Is dinner easy to manage with children?
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Dinner is seafood grilled over a net with a seasonal-vegetable buffet, and the venue has children's chairs and tableware. In summer only, a kids' corner gathers dishes children love, such as French fries and yakisoba fried noodles. Dinner starts at 6 p.m., with two seatings on busy days, and the breakfast buffet runs from 7 to 9 a.m.
How do we get to the hotel, and can we leave our luggage before check-in?
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A free shuttle bus departs Tateyama Station on the JR Uchibo Line at 2:40 p.m. and requires an advance reservation. You can also take the JR Kanto bus bound for Awa-Shirahama, get off at the Nojimazaki Todaiguchi stop and walk about 5 minutes; by car it is about 35 minutes from Tomiura IC on the Tateyama Expressway. Luggage other than valuables can be left before check-in — just ask a member of the front desk staff.
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Information on this page was compiled by directly consulting Official website, Rakuten Travel, 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.