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Hotel Green Plaza Karuizawa
forumWhat families say
Guests report that as the official hotel of Karuizawa Toy Kingdom, this property is especially popular with families traveling with young children, and families praise the lavish buffet and its range of child-friendly amenities. Some guests do note that because the hotel is large, the walk to the restaurant and communal bath can be long.
Categories
Kids Facilities
Themed Rooms (Baby Room / Mel-chan Friendship Room / Maisonette, and more)
Themed Rooms (Baby Room / Mel-chan Friendship Room / Maisonette, and more)
- paymentsPrice:Free for guests
The hotel offers many themed rooms you can choose to match your child's age and needs, including the Baby Room, Baby Room Happiness, the Mel-chan Friendship Room, a playable room designed for children, and maisonette-style Japanese-Western rooms.
- •数に限りがあります。
- •ベビーカーの利用はホテル内に限ります。
- •ベッドガードは生後18ヶ月〜5歳が対象です。
Karuizawa Toy Kingdom (adjacent)
Karuizawa Toy Kingdom (adjacent)
- paymentsPrice:Free for guests
Right in front of the hotel is Karuizawa Toy Kingdom (separately operated), where you can enjoy an obstacle course, an amusement park, and a hall of toys from around the world. Plans that include a free pass are available.
Japanese-Western-Chinese Buffet (age-staged baby food / kids' menu)
Japanese-Western-Chinese Buffet (age-staged baby food / kids' menu)
The Japanese, Western, and Chinese buffet (including local specialties) offers age-staged baby food for the early, mid, and late stages (such as pumpkin puree, chicken rice, and simmered tofu and fish) plus a kids' menu (such as mini hamburger steak and kids' curry). The eight major allergens are clearly listed. Children's tableware, high chairs, paper bibs, a food cutter, and more are provided.
Communal Bath (separate for men and women, fully equipped with baby amenities)
Communal Bath (separate for men and women, fully equipped with baby amenities)
The communal baths, separated for men and women, are equipped with a baby bath, a baby bath chair, and baby body soap. The changing rooms also have a baby rack, a crib, and a baby playpen, so families with babies can bathe with peace of mind. The bath uses the hotel's own source of Oku-Karuizawa Onsen, drawn from 1,600 meters underground.
- •Under Gunma Prefecture's public bathhouse law, mixed bathing is not allowed from around age 7 (first grade of elementary school) (official FAQ)
- •Whether babies who are not yet potty-trained may bathe is not explicitly stated by the hotel; checking with the hotel before your visit is recommended
- •The changing room has a baby rack, a crib, and a baby playpen
Kids' Playroom / Nursing Room
Kids' Playroom / Nursing Room
The kids' playroom inside the hotel is stocked with play equipment, picture books, and toys for young children (free for guests on the Baby Plan). The nursing room is a private room equipped with an auxiliary bed, a water server, a sink, a microwave, and a diaper bin.
Baby & Kids Items (free rental)
Baby & Kids Items (free rental)
The front desk lends out a wide range of baby and kids items free of charge. Strollers may only be used within the hotel. In addition, children's slippers, kids' hangers, futons, baby futons, and outlet caps are also available.
- checkStroller (A-type, about 50 available)
- checkBottle-warming kit / hot quick warmer
- checkChildren's ice pack
- checkAuxiliary toilet seat
- checkBaby lotion
- checkTeddy bear for settling babies to sleep
- checkWaterproof bed sheet (for bedwetting)
- checkThermometer
- checkFirst-aid kit
- checkPicture books (about 30 titles)
- checkBed guard (for children aged 18 months to 5 years)
- checkBaby scale with feeding-volume function
- checkMiki House infant pajamas (size 80)
- checkChildren's yukata (size 90 and up)
Overview
Hotel Green Plaza Karuizawa is a family resort in Tsumagoi Village, Gunma Prefecture (commonly known as Kita-Karuizawa), located right next to Karuizawa Toy Kingdom. It offers maisonette-style Japanese-Western rooms and themed rooms such as the Baby Room, Baby Room Happiness, and the Mel-chan Friendship Room, an age-staged baby food buffet, a communal bath fully equipped with baby amenities, a kids' playroom, and an in-house nursing room. The hotel is certified as a 'Welcome Baby' inn.
Hotel Green Plaza Karuizawa (operated by Hotel Green Plaza) is a family resort located in Tsumagoi Village, Gunma Prefecture (the official address), in an area commonly known as Kita-Karuizawa, right next to Karuizawa Toy Kingdom. It offers a wide range of themed rooms designed for families with children, including maisonette-style Japanese-Western rooms, the Baby Room and Baby Room Happiness, and the Mel-chan Friendship Room.
Dining
The restaurant serves a Japanese, Western, and Chinese buffet with a kids' menu and an age-staged baby food selection that lists the eight major allergens. Dining support is also well-equipped, including children's tableware, high chairs, and paper bibs. The nursing room is a private space with an auxiliary bed, a water server, a sink, a microwave, and a diaper bin.
Bath and Onsen
The communal baths, for both men and women, are equipped with a baby bath, a baby bath chair, and baby body soap, and the changing rooms have a baby rack, a crib, and a baby playpen. At the front desk, a wide range of items - a stroller (A-type), a bottle-warming kit, an toilet-training seat, baby lotion, a bed guard (for children aged 18 months to 5 years), and a baby scale with a feeding-volume function, among others - can be borrowed free of charge. Children aged 0 to 2 stay free of the room charge, with only a facility-use fee of JPY 2,000 (tax included) applying. The hotel is certified as a 'Welcome Baby' inn.
Other
From Kids Stay's point of view, what stands out about Hotel Green Plaza Karuizawa is how complete its facilities are for children from birth. The nursing room is a dedicated private space with an auxiliary bed, a water server, a sink, and a microwave; the changing room at the communal bath permanently has a crib, a baby rack, and a baby playpen; and the buffet offers age-staged baby food (early to late stages) with allergens clearly listed - very few hotels have all of this at once. The adjacent Karuizawa Toy Kingdom has many activities suited to children who can already walk, but even families with babies can enjoy a fully satisfying stay within the hotel itself. The pricing, with no room charge for children aged 0 to 2, also makes this a genuinely cost-effective choice for families traveling with infants and toddlers. 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 hotel shuttle is available, reservation required), or about 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 | 270 spaces, 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 |
Reference price as of August 22, 2026 (stay date 2026-09-12). Please check the booking site for actual rates.
Frequently Asked Questions
Do children stay free at Hotel Green Plaza Karuizawa?
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Children aged 0 to 2 do not pay the room charge - only a facility-use fee of JPY 2,000 (tax included) applies. A baby futon is also available for infants.
Can babies who still wear diapers use the communal bath?
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The hotel's facility information states there is no restriction on babies in diapers using the communal bath, and the changing rooms have a baby rack, a baby bed, and a baby playpen. Note that other official pages do not spell out this policy, so if it matters for your stay it's worth confirming directly with the hotel.
Is baby food provided at the hotel?
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Yes. The buffet includes hotel-made baby food for three age stages (early, mid, and late) with the eight major allergens clearly listed, plus a kids' menu with items such as mini hamburger steak and kids' curry.
What baby and kids items can be borrowed for free?
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The front desk lends out many items free of charge, including a stroller (A-type, about 50 available), a bed guard (for ages 18 months to 5 years), a baby scale with a feeding-volume function, a bottle-warming kit, an toilet-training seat, baby lotion, a thermometer, a first-aid kit, picture books, and Miki House infant pajamas, among others. Strollers may only be used within the hotel.
How do you get there, and is there parking?
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It's about 45 minutes by car from Karuizawa Station (a shuttle is available with reservation), or about 55 minutes from the Usui-Karuizawa IC on the Joshin-etsu Expressway via the Onioshi Highway (a toll road). The hotel has 270 free parking spaces.
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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.