Hotel Green Plaza Karuizawa
Reference price as of October 12, 2026 (stay 2026-11-07). US$ is an approximate conversion from yen. Check the booking site for actual rates.
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forumWhat families say
As the official hotel of Karuizawa Toy Kingdom, it is especially popular with families traveling with young children, and guests praise the lavish buffet and the wide range of children's amenities. Some guests note, however, that the building is large, so the walk to the restaurant and the communal bath is a long one.
Kids Facilities
Baby items to borrow at the front desk
Baby items to borrow at the front desk
- paymentsPrice:Free for guests
The front desk lends out a wide range of baby items free of charge, including an A-type stroller, bed guards, baby lotion, a baby scale with a feeding-volume function, plush toys for bedtime and picture books. Children aged 3 and over can use them too. Numbers are limited, so checking early is recommended.
- •Numbers are limited.
- •The stroller may be used inside the hotel only.
- •Bed guards are for children aged 18 months to 5 years.
Nursing room
Nursing room
- paymentsPrice:Free for guests
A private nursing room open 24 hours a day, with a water server for preparing formula and a diaper-changing table. There is also a sink and microwave for baby bottles and a diaper bin, and fathers may come in too when changing diapers.
Baby bathing equipment in the communal bath
Baby bathing equipment in the communal bath
The communal bath, fed by a natural onsen that rises from 1,600 m underground, has baby baths, baby bath chairs, head-to-toe baby soap and shampoo hats in both the men's and women's baths. There are no bathing restrictions for babies who wear diapers. The changing rooms also have baby racks, baby beds and baby playpens.
Kids' playroom
Kids' playroom
A kids' playroom near the front lobby, the restaurant and the Baby Rooms, with play equipment, picture books and toys that even young children can use with peace of mind. There is normally a fee, but guests staying in the Baby Room or Baby Room Happiness can use it free of charge as a benefit.
- •Regular use is subject to a fee.
- •Guests staying in the Baby Room or Baby Room Happiness can use it free of charge as a benefit.
Kids' menu and baby food
Kids' menu and baby food
The buffet of about 50 Japanese, Western and Chinese dishes includes a kids' menu and hotel-made baby food by age in months, with 3 kinds for each stage, and the 8 major allergens among the ingredients are clearly listed. Children's tableware, high chairs, paper bibs, small spoons and forks, food cutters and more are also provided.
Baby Room Happiness
Baby Room Happiness
A room exclusively for families with babies, laid entirely with flat, step-free tatami and furnished with a king-size low bed. It sleeps 3, and 2 adults plus 1 child under school age is the recommended setup. It is certified as a Welcome Baby hotel room by MIKI HOUSE Kosodate Soken.
Categories
Overview
Hotel Green Plaza Karuizawa is the official hotel of Karuizawa Toy Kingdom, a theme park on the same grounds as the hotel. It is certified as a Welcome Baby hotel by MIKI HOUSE Kosodate Soken, and it is well equipped for families with young children: Baby Rooms, baby items to borrow free of charge, baby food by age in months, and baby bathing equipment in the natural onsen that rises from 1,600 m underground, so even parents of little ones can relax. Children aged 0 to 2 pay only a facility fee, with no room charge.
Rooms
The Japanese-Western rooms in the Main Building are 26.4 sq m with a bath and toilet, and sleep 1 to 3 guests. The Japanese-Western rooms in the Connection Building sleep 1 to 5 guests. The maisonette type, with an 8.5-tatami Japanese-style tatami room on the first floor and a Western-style room with two single beds on the second floor, sleeps up to 7; in the tatami area, you lay out the futons yourself. For families with babies there are two room types. The Baby Room has a 4.5-tatami area and a king-size bed. Baby Room Happiness is laid entirely with flat, step-free tatami and has a king-size low bed; it sleeps 3, and 2 adults plus 1 child under school age is the recommended setup. Both are certified as Welcome Baby hotel rooms by MIKI HOUSE Kosodate Soken. In every room, beds are provided for up to 2 guests and futons are used from the third guest onward, and there is no futon-laying service. There are no barrier-free rooms, and each room has an en-suite bathroom and a toilet with a warm-water bidet seat. The Mel-chan Friendship Room, limited to 4 rooms a day, is a maisonette-type room in the Connection Building that sleeps 6, themed around Mel-chan and a whole lineup of her fellow dolls.
Dining
Dinner is a buffet of about 50 Japanese, Western and Chinese dishes, including regional specialties from the Joshu and Shinshu areas. It includes a kids' menu and hotel-made baby food by age in months, with 3 kinds for each stage. The 8 major allergens among the ingredients are clearly listed for both the kids' menu and the baby food. Children's tableware, high chairs, paper bibs, small spoons and forks, food cutters, feeding spoons and short straws are also provided.
Baths and Onsen
Akatsuki no Yu, a natural onsen that rises from 1,600 m underground, has an open-air rock bath, an open-air hinoki cypress bath, an indoor bath and a cave bath. There are no bathing restrictions for babies who wear diapers, and both the men's and women's communal baths have baby baths, baby bath chairs, head-to-toe baby soap and shampoo hats. The changing rooms also have baby racks, baby beds, baby playpens and diaper bins.
Family-Friendly Features
Children aged 0 to 2 pay only a facility fee of 2,000 yen (tax included), with no room charge. For children aged 0 to 2, MIKI HOUSE baby pajamas in an easy-to-move-in, separate top-and-bottom style (size 80 only) are available to borrow, and a children's amenity set with a body sponge and body wash is provided, which you can take home. The front desk lends out items free of charge in limited numbers, including a stroller (A-type, for use inside the hotel only) that children aged 3 and over can also use, bed guards (for ages 18 months to 5 years), baby lotion, a baby scale with a feeding-volume function, plush toys for bedtime and picture books. The shop also sells baby products such as diapers, baby wipes and powdered formula, which is reassuring if you have left something behind. The nursing room is open 24 hours a day. It is a private room, fully equipped with a water server for preparing formula, a diaper-changing table, a sink and microwave for baby bottles, and a diaper bin. The kids' playroom inside the hotel normally charges a fee, but guests staying in the Baby Room or Baby Room Happiness can use it free of charge as a benefit.
Access
The hotel is 45 minutes by car from Karuizawa Station (the shuttle requires a reservation) and 55 minutes from the Usui-Karuizawa IC on the Joshin-etsu Expressway via the Onioshi Highway, and it has free parking for 270 cars. A shuttle bus also runs on a fixed schedule between the bus terminal at the south exit of Karuizawa Station and the hotel; it requires a reservation, and the one-way trip normally takes about 60 minutes. Late checkout is at 11 a.m.
Access & Information
| location_onAddress | 2277 Omae Hosobara, Tsumagoi-mura, Agatsuma-gun, Gunma 377-1512 |
|---|---|
| directions_carAccess | About 45 minutes by car from Karuizawa Station (a shuttle is available by reservation), or 55 minutes from the Usui-Karuizawa IC on the Joshin-etsu Expressway via the Onioshi Highway, a toll road. |
| trainNearest station | Karuizawa Station |
| local_parkingParking | Parking for 270 cars, free of charge. |
| callPhone | +81-570-091-489 |
| paymentsCards | VISA, JCB, American Express, UC, DC, NICOS, OMC, UFJ Card, Saison, AEON, Rakuten Card |
| languageOfficial site | https://www.hgp.co.jp/karuizawa/open_in_new |
Map
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Reference price as of October 12, 2026 (stay 2026-11-07). US$ is an approximate conversion from yen. Check the booking site for actual rates.
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Frequently Asked Questions
What ages is Hotel Green Plaza Karuizawa best suited to?
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It has facilities that work especially well for babies and toddlers (ages 0 to 2) and children aged 3 and over. There is no age limit, and families with children of any age can stay.
Is there parking at Hotel Green Plaza Karuizawa?
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Parking: Parking for 270 cars, free of charge.
How do you get to Hotel Green Plaza Karuizawa?
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About 45 minutes by car from Karuizawa Station (a shuttle is available by reservation), or 55 minutes from the Usui-Karuizawa IC on the Joshin-etsu Expressway via the Onioshi Highway, a toll road.
Can a child who is not yet out of diapers use the communal bath?
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Yes. Babies who wear diapers can bathe there too, and along with the onsen's skin-friendly properties, baby soap and baby bath chairs are provided.
Can we use the nursing room at any time?
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The nursing room is open 24 hours a day. It is a private room with a water server for preparing formula and a diaper-changing table, so dads can come in too when changing diapers.
Is the kids' playroom free to use?
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The kids' playroom is open to everyone and normally charges a fee, but guests staying on the Baby Room or Baby Room Happiness plans can use it free of charge as a benefit.
How much does it cost for a child aged 0 to 2 to stay?
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There is no room charge for children aged 0 to 2; a facility fee of 2,000 yen (tax included) applies.
Can we choose baby food that matches our baby's age in months?
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Yes. Hotel-made baby food by age in months is available at both breakfast and dinner, with 3 kinds for each stage, and there is a full kids' menu as well.
We'd like our baby (under age 1) to co-sleep with us. Is there a charge?
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For children aged 0 to 2, only a facility fee of 2,000 yen (tax included) applies, with no room charge. Baby pajamas and an amenity set are also provided, so families with babies can stay with peace of mind.
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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.
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