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- Hotel Grand Mer Sankaiso
[A New Luxury Representing Aomori] All-Inclusive Onsen Resort Hotel
Our Accommodation is an all-inclusive Onsen resort where all drinks during your stay and fees for various activities are included in the accommodation rate. Our signature fossil seawater Onsen offers a spectacular setting overlooking the Sea of Japan from every bathing area: the large public bath, open-air bath, and private baths. In our dining venue, enjoy an open-kitchen buffet featuring mainly Aomori ingredients, with seasonal sashimi, premium meat dishes, and seasonal tempura beautifully presented. Savor a luxurious moment that will fill your heart—where ever-changing scenery, breathtaking baths, and exquisite cuisine come together. We sincerely look forward to welcoming you.
There was a Tsugaru Shamisen show, and I enjoyed the nostalgic atmosphere. Although I sometimes couldn't understand the Tsugaru dialect, it added to the charm. The room was renovated and very clean. The bath was also great. There were original items like cider, but unfortunately, I couldn't try them all. While waiting for the shuttle service at the station, I had some extra time but luckily came across a dance performance by elementary, junior high, and high school students in Ajigasawa. I had a wonderful time!
あちこちのんびり 9/8/2025It was an Onsen I had wanted to stay at for a long time. I was very satisfied with the accommodation, thank you for your hospitality.
旅行S 12/19/2025
Facilities and Services
See All- Hot spring
- Spa facility
- Accessibility
| IN | 15:00～22:00 |
|---|---|
| OUT | 10:00 |
| Number of rooms | 80 rooms |
| Pet | Not allowed |
| Your child | Permitted |
Photo
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- Single
- 15㎡
- Capacity 1~2 people
- Japanese-style Room
- Capacity 1~5 people
- Twin
- 21㎡
- Capacity 1~2 people
Best-Selling Stays
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Hotel Popular For Public Bath
Stays Popular For Open-Air Bath
Recommended Accommodation For Honeymoon
Relaxing Japanese-Style Accommodation
Introduction of the Accommodation
Our spacious, serene Japanese-style rooms and our modern Western-style rooms—elegant, refined, and nostalgically charming—offer the perfect setting for a restful adult getaway. Please relax and enjoy your time here at your own pace. From October 1, 2022, we introduced an all-inclusive stay plan. We invite you to unwind and enjoy a soothing, unhurried escape.
Ajigasawa is blessed with seasonal harvests of local cuisine and seafood throughout the year, allowing us to source fresh ingredients at all times. We carefully prepare Ajigasawa’s finest seasonal ingredients—available only at that time of year—and offer dishes that deliver a truly delicious experience and lasting memories.
The open-air bath overlooking the majestic Sea of Japan features a rare natural Onsen fed by ancient seawater known as “fossil seawater.” Long ago, seawater trapped deep underground matured over 300,000 years into this restorative spring. Rich in fossil seawater, it has a high salt content that helps retain warmth and moisture, so you stay comfortable longer after bathing—like a natural form of thalassotherapy (marine therapy).
All Plans at our Accommodation are all-inclusive. Drinks in the lounge and dining venues, as well as fees for various activities, are all included in the accommodation rate. Please enjoy a relaxing and soothing stay.
In addition to fishing experiences, bicycle rentals, and yoga, you can enjoy your stay in your own way both on and off the property with options such as private baths and karaoke.
Facilities and Equipment of Accommodation
- The room
- Hot Springs & Baths
- Facilities & Services
- Meal
Basic Information
| Taxes | Hot Spring Tax (150 yen) |
|---|---|
| Card information | VISA / MASTER / JCB / AMEX / DINERS / UnionPay / Debit card |
| Pets | Not allowed |
| Breakfast | We offer a highly acclaimed Japanese-Western buffet featuring Tsugaru's local cuisine and freshly made French toast. |
| Your child | You can stay. - Junior high school students are considered adults.
- Elementary school students are included in the number of adults.
- Elementary school students and younger are exempt from the Hot Spring Tax.
■ The fee for elementary school students is 70% of the adult rate.
■ Admission fee for infants is ¥1,815 (tax included).
■ Infants (with meals/bed) are charged 50% of the adult rate (tax included).
Infants (meals only) are charged ¥6,215 (tax included).
■ Children aged 0–2 years stay free of charge (Child Sharing Existing Bedding).
■ Child Sharing Existing Bedding applies to children not yet in elementary school. |
| Room service | Not available |
| Common amenities |
|
| Facilities and Features |
|
| Esthetic Massage | Available Thalasso Pack
(Other courses are also available. Please contact us for details.)
◇ Body 30 minutes: 6,600 yen ◇ Face 30 minutes: 5,500 yen
* By complete reservation only.
* We may not be able to accommodate your request depending on the situation.
* Please check in at least one hour before your reservation time.
* Not available for those with thyroid conditions.
* May not be suitable for individuals with skin allergies or those who are pregnant.
Business Hours: 16:00–22:00 |
| Fitness gym | None |
| Public Bath |
|
| Open-air bath |
|
| Private bath |
|
| Spring quality and benefits | Chloride Strong Saline Hot Spring Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive disorders, sensitivity to cold, recovery from illness, fatigue recovery, health promotion ※Regarding the notation of "Gensen Kakenagashi" |
| Sauna | Available |
| Hot stone spa | None |
| Others | Wi-Fi available throughout the entire property. |
| About Hygiene Measures | To ensure a safe and comfortable stay, we have implemented enhanced measures focusing on "Hygiene Management" and "Avoiding Crowded Spaces."
Our staff wear masks, gloves, and wash their hands during customer service, cooking, and cleaning tasks. Alcohol-based sanitization is strictly enforced at employee entrances.
*Details of our measures are available on our official website.*
【For Our Guests】
- If you experience fever or feel unwell, please contact the front desk without leaving your room.
- Thermometers are available upon request. Please ask at the front desk or inform nearby staff.
【Specific Infection Prevention Measures】
- Managing guest flow to avoid crowding during check-in/out.
- Preventive measures in shared spaces such as lobbies, public baths, dining areas/restaurants.
- Installation of hand sanitizing stations at entrances and throughout the facility.
- Regular ventilation of facilities and rooms.
- Frequent disinfection of shared items and high-touch surfaces.
■ General Measures Across All Areas
- Minimize shared items or frequently touched surfaces through innovative solutions.
- Regular disinfection of high-touch areas.
- Proper cleaning/disinfection or use of disposable items for utensils like cups/chopsticks.
- Frequent washing of uniforms/clothing worn by staff.
- Ensure availability of alcohol-based hand sanitizer for guests/staff throughout the facility.
■ Entrance (Lobby)
- Hand sanitizing stations installed at entrances/lobby areas with requests for usage upon entry.
■ Check-In/Check-Out
- Frequent disinfection of front desk counters/pens used by guests.
- Thorough disinfection after key returns.
- Contactless check-out via card payment options available.
■ Elevators
- Regular cleaning/disinfecting inside elevators including buttons.
■ Guest Rooms
- Disinfect high-touch surfaces such as TV remotes air conditioning controls safes light switches tables closets refrigerators telephones toilets faucets slippers etc using appropriate agents bleach detergents swapped out sanitized replacements provided where necessary amenities disposed post-use towels rotated fresh ones stocked regularly windows opened periodically ventilate properly . |
Reviews
- Rooms & Amenities4.27
- Facility4.18
- Hospitality & Service4.39
- Meals4.24
- Onsen & Bath4.39
- Satisfaction4.30
*Reviews that have been translated from Japanese.*
*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*
Access Information
Aomori PrefectureNaruto 1, Maitocho, Ajigasawa-machi, Nishitsugaru-gun
TEL：+81-173-72-8111
■ By Car: Approximately 50 minutes (40 km) from Tohoku Expressway Namioka IC via Route 101
■ By Train or Plane: JR Tohoku Shinkansen (Shin-Aomori Station) or JAL flight (Aomori Airport)
*Free Shuttle Service is available between JR Gono Line Ajigasawa Station and Hotel Grand Mer Sankaiso. Please make a Reservation by the day before your use.*
- Parking Information
- Fee
- Free for guests
- Parking time
- Check-in to Check-out
- Parking space
- No restrictions
- Number of parking spaces
- 200 cars available outdoor
- Valet service
- Unavailable
- Pickup and drop-off information
- Available (Free)Free shuttle service is available between JR Gono Line Ajigasawa Station and Hotel Grand Mer Sankaiso.
5 trips daily: 14:50, 15:50, 16:20, 17:25, 18:00
*Please make a reservation by the day before your use.
*The bus will stop at our sister accommodation, Ajigasawa Onsen "Suigun no Yado," on the way.
Frequently Asked Questions
Please provide information about Open-air bath.
・Business Hours: 05:00～23:00 ・Hot spring: Available ・Free-flowing: None ・Cloudy hot spring water: None ・Supplementary information: (Heating) *Bathing hours are 5:00–10:00 and 15:00–23:00. *The baths are alternated between men and women, so you can enjoy both the Japanese-style and Western-style bath areas.
What are the qualities and benefits of the hot spring water?
The spring quality and efficacy of the hot spring are as follows. ・Spring quality: Chloride Strong Saline Hot Spring ・Spring efficacy: Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive disorders, sensitivity to cold, recovery from illness, fatigue recovery, health promotion
What kind of facilities and features are available?
There are the following facilities and features. Hot spring・Open-air bath・Free-flowing hot spring・Large public bath・Private bath・Sauna・Spa facility・Free shuttle service・Barrier-free
I would like to know the access information.
■ By Car: Approximately 50 minutes (40 km) from Tohoku Expressway Namioka IC via Route 101 ■ By Train or Plane: JR Tohoku Shinkansen (Shin-Aomori Station) or JAL flight (Aomori Airport) *Free Shuttle Service is available between JR Gono Line Ajigasawa Station and Hotel Grand Mer Sankaiso. Please make a Reservation by the day before your use.*
Is parking available?
・Fee： Free for guests ・Parking Hours： Check-in to Check-out ・Parking space： Length --- Vehicle width --- Vehicle height --- ・Number of parking spaces： 200 cars ・Valet Service： Unavailable
Please provide information about Private bath.
・Business Hours: 08:00～23:00 ・Hot spring: Available ・Free-flowing: None ・Cloudy hot spring water: None ・Supplementary information: (Heating) [Available Hours] 8:00–10:00, 15:00–23:00 (last admission 22:00) [Session Length] 45 minutes * Guests staying at this Accommodation may use the service at no additional charge. * Reservations can be made after check-in via the in-house Reservation system. * In principle, advance Reservations are not accepted.
Is there a sauna?
Yes, there is.
Do you have esthetic massages?
Yes, there is. Thalasso Pack (Other courses are also available. Please contact us for details.) ◇ Body 30 minutes: 6,600 yen ◇ Face 30 minutes: 5,500 yen * By complete reservation only. * We may not be able to accommodate your request depending on the situation. * Please check in at least one hour before your reservation time. * Not available for those with thyroid conditions. * May not be suitable for individuals with skin allergies or those who are pregnant. Business Hours: 16:00–22:00
What kind of hygiene management is being conducted?
To ensure a safe and comfortable stay, we have implemented enhanced measures focusing on "Hygiene Management" and "Avoiding Crowded Spaces." Our staff wear masks, gloves, and wash their hands during customer service, cooking, and cleaning tasks. Alcohol-based sanitization is strictly enforced at employee entrances. *Details of our measures are available on our official website.* 【For Our Guests】 - If you experience fever or feel unwell, please contact the front desk without leaving your room. - Thermometers are available upon request. Please ask at the front desk or inform nearby staff. 【Specific Infection Prevention Measures】 - Managing guest flow to avoid crowding during check-in/out. - Preventive measures in shared spaces such as lobbies, public baths, dining areas/restaurants. - Installation of hand sanitizing stations at entrances and throughout the facility. - Regular ventilation of facilities and rooms. - Frequent disinfection of shared items and high-touch surfaces. ■ General Measures Across All Areas - Minimize shared items or frequently touched surfaces through innovative solutions. - Regular disinfection of high-touch areas. - Proper cleaning/disinfection or use of disposable items for utensils like cups/chopsticks. - Frequent washing of uniforms/clothing worn by staff. - Ensure availability of alcohol-based hand sanitizer for guests/staff throughout the facility. ■ Entrance (Lobby) - Hand sanitizing stations installed at entrances/lobby areas with requests for usage upon entry. ■ Check-In/Check-Out - Frequent disinfection of front desk counters/pens used by guests. - Thorough disinfection after key returns. - Contactless check-out via card payment options available. ■ Elevators - Regular cleaning/disinfecting inside elevators including buttons. ■ Guest Rooms - Disinfect high-touch surfaces such as TV remotes air conditioning controls safes light switches tables closets refrigerators telephones toilets faucets slippers etc using appropriate agents bleach detergents swapped out sanitized replacements provided where necessary amenities disposed post-use towels rotated fresh ones stocked regularly windows opened periodically ventilate properly .