Relax to the sound of the waves and the scent of the sea, and fully enjoy Boso’s ocean bounty and natural Onsen.

Onosou is an Accommodation founded by the previous generation of a diver, with the wish to share delicious local ingredients such as spiny lobster and abalone with many people. That spirit lives on today, and we continue to serve dishes made with locally sourced ingredients. Step away from the bustle of everyday life and enjoy our signature meals in Onjuku, where time flows gently and local flavors abound. Our enchanting bath to soothe travel fatigue features Onjuku’s natural brown-hued Onsen, “Bijin-no-Yu,” known for helping relieve fatigue and sensitivity to cold. You can also relax and lose track of time in our bath area produced by special effects sculptor and decorator “Katsu”. The main beach with Onjuku’s white sand is just a 1-minute walk away.

Reviews

(5)
The facility's overall score is hidden because the specified number of cases has not been reached.

Facilities and Services

See All
  • Hot spring
  • Room with Open-Air Bath
Private bath / Free shuttle service
IN15:00~17:30
OUT10:00
Number of rooms6 rooms
PetNot allowed
Your childPermitted
Universal Room – Overall View 1
Mar 5, 2026Renovated
  • Japanese-Western room
  • 23㎡
  • Capacity 1~4 people

[No Meals Included Plan] Relaxing Stay with the Sea and Onsen in Onjuku

IN 15:00~20:00
OUT 10:00
¥34,000~
No meals ; 2 peopleTax included¥31,620〜
(USD 200.34)

[Breakfast-Included Plan] Recommended for both sightseeing and business trips! Relax with the sea and Onsen.

IN 15:00~20:00
OUT 10:00
¥38,000~
Breakfast included ; 2 peopleTax included¥35,340〜
(USD 223.91)

[No Meals Included Plan] Relaxing Stay with the Sea and Onsen in Onjuku

IN 15:00~20:00
OUT 10:00
¥37,000~
No meals ; 2 peopleTax included¥34,410〜
(USD 218.02)

[Breakfast-Included Plan] Recommended for both sightseeing and business trips! Relax with the sea and Onsen.

IN 15:00~20:00
OUT 10:00
¥41,000~
Breakfast included ; 2 peopleTax included¥38,130〜
(USD 241.59)
Universal Suite Entrance 1
Mar 5, 2026Renovated
  • Japanese-Western room
  • 79㎡
  • Capacity 1~5 people

[No Meals Included Plan] Relaxing Stay with the Sea and Onsen in Onjuku

IN 15:00~20:00
OUT 10:00
¥49,000~
No meals ; 2 peopleTax included¥45,570〜
(USD 288.73)

[Breakfast-Included Plan] Recommended for both sightseeing and business trips! Relax with the sea and Onsen.

IN 15:00~20:00
OUT 10:00
¥53,000~
Breakfast included ; 2 peopleTax included¥49,290〜
(USD 312.30)

Best-Selling Stays

Recommended Accommodation For Middle And High School Student Trips

Recommended Accommodation For High School Student Trips

Accommodation Suitable For Families With Elementary School Girls

Accommodation With Onsen Spa Relaxation

Accommodation With Extensive Drink Service

Accommodation Convenient For Family Sightseeing With Children

Ranking Of Accommodation With Delicious Dinner Buffet

Introduction of the Accommodation

Notice from the Accommodation

  • Grilled Spiny Lobster Shells

    The Onjuku Spiny Lobster Festival will be held!

    Thank you for your patience!
    Our annual spiny lobster festival will be held from September to October.

    During the event, we will offer a great-value Plan that lets you enjoy two in-season spiny lobsters!

    We look forward to welcoming you to our hotel.

Basic Information

Card information
VISA / MASTER / JCB / AMEX
Pets
Not allowed
BreakfastThere is no information about breakfast.
Your child
You can stay.
Meals will be served as a kids’ meal. If you would like the same meal as adults, please make a Reservation at the adult rate.
Room service
Not available
Common amenities
  • ○ Shampoo · conditioner
  • ○ Body soap · soap
  • ○ Face towel
  • ○ Bath towel
  • ○ Body towel · sponge
  • ○ Toothbrush set
  • ○ Comb · Brush
  • ○ Shower cap
  • ○ Hair dryer
  • ○ Shaving
  • ○ Shaving Gel/Foam
  • × Bath additives
  • ○ Yukata
  • ○ Pajamas
  • × 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
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
Private bath
The number of Private bath
2
Business Hours
15:00~09:00
Hot spring
Available
Free-flowing
None
Milky hot spring water
Available
Additional Information
(Heating, Adding Water)
Remarks
*Both are private baths and can accommodate approximately 4 to 5 guests. *You may use the bath during the time you reserved at check-in.
Room with Open-Air Bath
Hot spring
None
Free-flowing
None
Milky hot spring water
None
Additional Information
Remarks
Warm up gently and comfortably in a handmade Shigaraki-yaki ceramic bathtub with far-infrared heat.
Spring quality and benefits

Sodium Bicarbonate Cold Mineral Spring

Neuralgia, muscle pain, joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive disorders, hemorrhoids, sensitivity to cold, recovery after illness, fatigue recovery, health promotion, cuts and minor wounds (including abrasions), burns (including scalds), and chronic skin conditions Diabetes; mild hypercholesterolemia; mild asthma or pulmonary emphysema; peripheral circulatory disorders; and dry skin conditions

SaunaNone
Hot stone spaNone

Reviews

The overall facility score is not displayed because the required number of reviews has not been reached.

*Reviews that have been translated from Japanese.*

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

Access Information

Address
Chiba Prefecture775 Shinmachi, Onjuku-machi, Isumi-gun
TEL:+81-470-68-5511

An 8-minute walk straight from JR Onjuku Station.

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

Pickup and drop-off information
Available (Free)Shuttle Service is available by Reservation only. Depending on the time of day, we may not be able to accommodate your request.

Frequently Asked Questions

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