A healing property embraced by nature "Unzen Onsen Seiunso"

Located at an altitude of approximately 700m within a national park, "Unzen Onsen Seiunso" offers a relaxing retreat surrounded by nature. The spacious guest rooms feature sophisticated designs and a bright atmosphere, providing the comfort of home. Enjoy exquisite dishes crafted with local ingredients, showcasing the chef's exceptional skills. The milky-white Onsen water from our private source is known as "beauty-enhancing water," allowing you to unwind while immersed in the stunning seasonal scenery.

  • The Onsen was wonderful.The Hotel and Room were very clean and well maintained, and both dinner and breakfast were delicious. My friends and I were all very satisfied!Highly recommended.

    Yahoo!トラベルユー... 2/14/2026
  • As you cross the mountains and enter the Unzen Onsen area, the scent of sulfur becomes stronger. The bluish milky-white Onsen is visually appealing, and you can immediately feel its rich quality upon entering. Since it was my first time at Unzen Onsen, I couldn't compare it to other hot springs in the area, but it was a charming and high-quality bath. Truly impressive! Even in January, the water is warm, and you stay cozy long after bathing. During winter, with a significant temperature difference between the water and air, both outdoor baths and indoor baths are filled with soothing steam for ultimate relaxation. Since it was a weekday, I could enjoy three private-like sessions—after check-in, after dinner, and early morning.I stayed in a Standard Twin Room. Both the building interior and room were modern and impeccably clean, making my stay very comfortable.For dinner, we chose the Standard Plan (Unzen Seasonal Kaiseki). The portion size was just right for us as a couple in our 50s. The individually prepared kamameshi rice dish was freshly cooked and delicious.Breakfast included a set meal as per plan expectations; however, the rice was so tasty that I had seconds to fill up.From check-in to meals to check-out, all staff provided excellent service—thank you very much! As it's far away from home for us to visit often, we may not return frequently; however if we do come back to Unzen again someday—we would love to stay here once more!

    Yahoo!トラベルユー... 1/17/2026

Facilities and Services

See All
  • Hot spring
Open-air bath / Free-flowing hot spring / Large public bath / Private bath / Free shuttle service
IN15:00~19:00
OUT10:00
Number of rooms63 rooms
PetNot allowed
Your childPermitted
■Standard Twin [24 sqm]■
  • Twin
  • 24㎡
  • Capacity 1~2 people

[1 Night, 2 Meals Included] Unzen Colorful Kaiseki with Seasonal Ingredients

IN 15:00~19:00
OUT 10:00
¥32,600
Dinner and Breakfast included ; 2 peopleTax included¥26,080
(USD 163.23)

【1 Night with 2 Meals】Savor the authentic flavor of meat! Nagasaki Wagyu raised by Nagasaki's nature and seasonal cuisine.

IN 15:00~19:00
OUT 10:00
¥36,600
Dinner and Breakfast included ; 2 peopleTax included¥29,280
(USD 183.26)
Stylish Japanese-Style Room
  • Japanese-style Room
  • 33㎡
  • Capacity 1~3 people

IN 15:00~19:00
OUT 10:00
¥33,600
Dinner and Breakfast included ; 2 peopleTax included¥26,880
(USD 168.24)

[1 Night, 2 Meals Included] Unzen Colorful Kaiseki with Seasonal Ingredients

IN 15:00~19:00
OUT 10:00
¥34,600
Dinner and Breakfast included ; 2 peopleTax included¥27,680
(USD 173.24)
Japanese-style Superior Room [Triple]
  • Japanese-style Room
  • 39㎡
  • Capacity 2~4 people

IN 15:00~19:00
OUT 10:00
¥34,600
Dinner and Breakfast included ; 2 peopleTax included¥27,680
(USD 173.24)

[1 Night, 2 Meals Included] Unzen Colorful Kaiseki with Seasonal Ingredients

IN 15:00~19:00
OUT 10:00
¥35,600
Dinner and Breakfast included ; 2 peopleTax included¥28,480
(USD 178.25)

Best-Selling Stays

Stays With High Ratings

Hotel Popular For Public Bath

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Rooms With Open-Air Baths Popular At Stays

Stays Popular For Natural Hot Springs

Recommended Accommodation For Honeymoon

Accommodation With No Meals Included

Relaxing Japanese-Style Accommodation

Introduction of the Accommodation

Onsen

Enjoy the skin-beautifying waters at Seiunso's natural Onsen with free-flowing hot spring sources.

The Onsen at Seiunso features natural flowing water from its private source. The milky white water, known as "Bijin no Yu" (beauty-enhancing water), is cherished for its skin benefits and abundant flow. Enjoy the open-air bath surrounded by the great nature of Unzen or relax in the spacious indoor bath. Indulge in a blissful time to soothe your daily fatigue.

Guest Rooms

Relax in a cozy room that embraces the warmth of nature.

The rooms at Seiunso are bright spaces filled with natural light. Featuring spacious layouts, each Room is characterized by sophisticated interiors. Complimentary Wi-Fi and well-equipped in-room amenities ensure a comfortable stay. A variety of options, including Japanese-style and Western-style Rooms, are available to suit your needs.

Seasonal Special Kaiseki

Enjoy seasonal dishes featuring local delicacies from both land and sea.

At the Seiunso restaurant, we serve dishes made with locally sourced ingredients nurtured by the rich nature of the Shimabara Peninsula. Our chef's exquisite creations reflect the changing seasons. The breakfast, featuring local flavors, offers a daily-changing menu to ensure even guests on a Multiple Night Stay enjoy variety.

Facilities and Equipment of Accommodation

  • The room
    The room
  • Hot Springs & Baths
    Hot Springs & Baths
  • Meal
    Meal

Notice from the Accommodation

  • Seiunso Exterior (Daytime)

    Notice of School Trip Accommodation Schedule

    - Notice of School Trip Schedule
    Thank you for choosing Unzen Onsen Seiunso.
    We would like to inform you of the scheduled dates for school trip accommodations until December 2026.
    During students' bathing times, the large public bath and private baths will be temporarily unavailable.
    However, the open-air bath will remain available as usual.
    We apologize for any inconvenience this may cause to our guests and kindly ask for your understanding and cooperation.

    【Scheduled School Trip Accommodation Dates】
    2026:
    February: 3rd, 4th
    March: 4th
    May: 13th, 14th, 19th, 21st, 27th, 28th, 29th
    June: 2nd, 4th, 17th
    September: 29th, 30th
    October: 4th,8 th ,14 th ,15 th ,16 th ,18 th ,20 th ,22 nd ,27 th ,28 th ,29 t h
    November :4 t h5t h13t h24t h26t
    December

Basic Information

Card information
VISA / MASTER / JCB / AMEX / DINERS
Pets
Not allowed
BreakfastThere is no information about breakfast.
Your child
You can stay.
Room service
Not available
Common amenities
  • × Shampoo · conditioner
  • × Body soap · soap
  • ○ Towel · Bath towel
  • × Body towel · sponge
  • ○ Toothbrush set
  • ○ Comb · Brush
  • × Shower cap
  • ○ Hair dryer
  • × Shaving
  • × Shaving Gel/Foam
  • × Bath additives
  • ○ Yukata
  • ○ Nightwear
  • × Bathrobe
  • ○ Slippers
  • ○ facial cleanser
  • × Toner
  • × Lotion
  • × Makeup remover
  • × Cotton swab
  • × Cotton
  • × Clothing deodorizing spray
  • ○ Refrigerator
  • × Minibar
  • ○ Electric kettle
  • × Tea set (free)
  • ○ Television
  • ○ Safe
  • × Scale
  • × Trouser press
  • × Free morning edition
  • × Pay-per-view broadcast
  • ○ Satellite broadcasting
  • × Video on Demand
  • × Radio
  • × CD player
  • × DVD player
  • × Blu-ray player
  • × Speakers for portable audio
  • × In-room PCs and tablets
Facilities and Features
  • ○ Hot spring
  • × Rooms with open-air baths available
  • ○ Open-air bath
  • ○ Free-flowing hot spring
  • ○ Large public bath
  • ○ Private bath
  • × Sauna
  • × Ganbanyoku (rock bathing)
  • × Within a 5-minute walk from the station
  • × Within a 5-minute walk to the convenience store.
  • × Indoor pool
  • × Outdoor pool
  • × Pet-friendly
  • × Spa facility
  • × Fitness
  • ○ Free shuttle service
  • × Shuttle Service (Paid)
  • × Room service
  • × Room Service Available 24 Hours
  • × Barrier-free
  • × Childcare services
Esthetic Massage
None
Fitness gym
None
Public Bath
The number of Public Bath
2
Business Hours
11:00~08:30
Hot spring
Available
Free-flowing
Available
Milky hot spring water
Available
Additional Information
(Add water)
Remarks
Available from 11:00 AM to 8:30 AM the next morning.
Open-air bath
The number of Open-air bath
2
Business Hours
07:00~21:00
Hot spring
Available
Free-flowing
Available
Milky hot spring water
Available
Additional Information
(Add water)
Remarks
Private bath
The number of Private bath
2
Business Hours
---
Hot spring
Available
Free-flowing
Available
Milky hot spring water
Available
Additional Information
(Add water)
Remarks
Paid 2,500 yen (50 minutes) *Reservation required
Spring quality and benefits

Simple Onsen, Sulfur Onsen

Neuralgia, muscle pain, joint pain, digestive disorders, cold sensitivity, fatigue recovery, skin diseases, gynecological diseases, diabetes, hypertension, arteriosclerosis

SaunaNone
Hot stone spaNone

Reviews

Overall Score
4.51
Wonderful (53)
  • Rooms & Amenities
    4.43
  • Facility
    4.49
  • Hospitality & Service
    4.36
  • Meals
    4.45
  • Onsen & Bath
    4.77
  • Satisfaction
    4.53

*Reviews that have been translated from Japanese.*

*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*

Access Information

Address
Nagasaki PrefectureUnzen City, Obama Town, Unzen 500-1
TEL:+81-957-73-3273

- Nearest station: JR Isahaya Station (approximately 50 minutes by car)
- Nearest airport: Nagasaki Airport (approximately 70 minutes by car)
- Nearest IC: Isahaya IC (approximately 50 minutes by car)
- Nearest port: Shimabara Port (approximately 60 minutes by car or bus)

Parking Information
Fee
Free for guests
Parking time
---
Parking space
No restrictions
Number of parking spaces
200 cars available outdoor
Valet service
Unavailable

Pickup and drop-off information
Available (Free)※Reservation Required

Frequently Asked Questions

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