Experience beautiful skin and health at an Onsen with a thousand years of history, and savor a once-in-a-lifetime moment with seafood tea kaiseki.

Ikona-so is an Accommodation in Izu Nagaoka Onsen, featuring private open-air baths and a luxurious seafood tea kaiseki cuisine. With a history spanning over a thousand years, our Onsen is a radium hot spring that makes generous use of “Bad Gastein ore,” and is highly regarded as a beautifying bath. The synergy of free-flowing hot spring water and natural radium helps refresh both body and mind. In our rooms with open-air baths and in the private open-air baths, you can enjoy truly private moments without concern for others’ eyes. Dining features an exquisite seafood tea kaiseki meal. Our seafood-based tea kaiseki dishes are exceptional—please savor each once-in-a-lifetime course. Guest rooms offer a calm, traditional Japanese atmosphere, and all in-room open-air and indoor baths use natural Onsen water. Enjoy a relaxing stay in Izu Nagaoka.

  • It was unfortunately raining that day, so we stopped by the newly opened Izu no Kuni History Museum “Izushiru” before checking in. The welcome drink system, where you can choose your preferred drink from a vending machine, felt efficient and practical. I absolutely loved the gift zori sandals in our Room and will take good care of them. We used the private open-air bath again this time. There are now two washing stations, so even as a couple we didn’t have to wait and it was very comfortable. The slightly thick, silky hot spring water is wonderful. The floor chair in the Room had been replaced with a higher chair, making it even more comfortable than before. Since it was raining, we enjoyed soaking in the open-air bath attached to our guest room and watching baseball on one of the two TVs that can receive satellite channels. All of the meals were delicious and the portions were just right. After dinner, being able to use the coffee machine in the lobby also added to our satisfaction. All of the staff were very pleasant and welcoming. There’s no excessive service—just a great Accommodation you can enjoy even on rainy days—and my wife likes it too, so it’s becoming our regular place in Izu Nagaoka. We look forward to staying again.

    Yahoo!トラベルユー... 6/23/2026
  • Being able to enjoy it whenever I wanted made the cypress bath in the Room truly wonderful.Even though it was No Meals Included, I was glad I could stay at this price, and the Room was very spacious.I would like to stay again.

    Yahoo!トラベルユー... 6/13/2026

Facilities and Services

See All
  • Hot spring
  • Room with Open-Air Bath
Open-air bath / Free-flowing hot spring / Large public bath / Private bath
IN14:00~24:00
OUT10:00
Number of rooms13 rooms
PetNot allowed
Your childPermitted

【No Meal Plan】Day-use Onsen is not enough! ~Unlimited free private baths~

IN 14:00~22:00
OUT 10:00
¥19,920
No meals ; 2 peopleTax included¥16,138
(USD 101.97)

【New Easy Plan】1 Night with Breakfast ~ Unlimited Free Private Bath ~

IN 14:00~22:00
OUT 10:00
¥23,520
Breakfast included ; 2 peopleTax included¥19,058
(USD 120.42)

【No Meal Plan】Day-use Onsen is not enough! ~Unlimited free private baths~

IN 14:00~22:00
OUT 10:00
¥20,400
No meals ; 2 peopleTax included¥16,530
(USD 104.45)

【New Easy Plan】1 Night with Breakfast ~ Unlimited Free Private Bath ~

IN 14:00~22:00
OUT 10:00
¥24,000
Breakfast included ; 2 peopleTax included¥19,440
(USD 122.84)

【No Meal Plan】Day-use Onsen is not enough! ~Unlimited free private baths~

IN 14:00~22:00
OUT 10:00
¥21,600
No meals ; 2 peopleTax included¥17,500
(USD 110.58)

【New Easy Plan】1 Night with Breakfast ~ Unlimited Free Private Bath ~

IN 14:00~22:00
OUT 10:00
¥25,200
Breakfast included ; 2 peopleTax included¥20,420
(USD 129.03)

Best-Selling Stays

Stays Popular For Natural Hot Springs

Popular Accommodation For People In Their 20s

Accommodation Convenient for Exploring Natural Attractions

Introduction of the Accommodation

Open-air bath

Ikona-so’s Onsen with a thousand-year history

Ikona-so’s Onsen features a radium bath generously infused with “Bad Gastein ore.” Known as a “beautifying hot spring,” it is highly praised by guests who say their skin feels noticeably different—our proud signature Onsen. Using abundant “Bad Gastein ore” from the Heilstollen (therapeutic tunnel) in Bad Gastein, Austria, a world-famous spa resort, the combination of the ore and the Izu Nagaoka spring water allows you to enjoy a pleasant natural radium warm bath in the bathing area. The water flowing from the spout is never recirculated—this is a free-flowing radium Onsen. The large public bath, private open-air bath, and all in-room open-air and indoor baths are 100% natural hot spring water directly from the source. The spring quality is simple alkaline hot spring water, with expected benefits for neuralgia, muscle fatigue, frozen shoulder, gastrointestinal weakness, and more.

Original bed

Original bed

They say beauty and wellness begin with high-quality sleep. At Ikona-so, we offer our original beds made with custom urethane and pocket coils to help you enjoy truly exceptional rest. We also provide low-dust “dustless” pillows made with endless fiber, along with our original dustless duvets. Please experience this premium comfort for yourself. *Beds are available only in the Japanese-Western style rooms (“Asahi” and “Yuzuki”).*

Facilities and Equipment of Accommodation

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

Basic Information

Card information
VISA / MASTER / JCB / AMEX / DINERS
Pets
Not allowed
Breakfast【Breakfast】Dining Area
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
06:00~24:00
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Cleaning hours are from 12:00 AM to 6:00 AM.
Open-air bath
The number of Open-air bath
2
Business Hours
06:00~24:00
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Cleaning hours are from 12:00 AM to 6:00 AM.
Private bath
The number of Private bath
2
Business Hours
06:00~24:00
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Cleaning hours are from 12:00 AM to 6:00 AM.
Room with Open-Air Bath
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Room with Onsen Indoor Bath
Hot spring
Available
Free-flowing
Available
Milky hot spring water
None
Additional Information
100% natural hot spring
Remarks
Spring quality and benefits

Mildly alkaline simple hot spring

Bruises / Muscle Pain / Sensitivity to Cold

※Regarding the notation of "Gensen Kakenagashi"
In some facilities, heating or adding water for temperature adjustment may be performed. Additionally, please note that in some parts of the facility, the hot spring water may not be free-flowing from the source. For more details, please contact each facility.

SaunaNone
Hot stone spaNone
Others【Other Accepted Cards】 UC, DC, NICOS

Reviews

Overall Score
4.57
Wonderful (20)
  • Rooms & Amenities
    4.55
  • Facility
    4.30
  • Hospitality & Service
    4.65
  • Meals
    4.53
  • Onsen & Bath
    4.85
  • Satisfaction
    4.55

*Reviews that have been translated from Japanese.*

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

Access Information

Address
Shizuoka Prefecture243-3 Kona, Izunokuni City, Shizuoka Prefecture
TEL:+81-55-948-0868

Transfer at Mishima Station on the Tokaido Shinkansen to the Izu Hakone Railway and get off at Izu-Nagaoka Station.
Take the Izu Odoriko train from Tokyo Station and get off at Izu-Nagaoka Station.
From Izu-Nagaoka Station, take a bus for 5 minutes and get off at "Sogo Kaikan Axis Katsuragi-mae," which is a 0-minute walk.

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

Pickup and drop-off information
Unavailable

Frequently Asked Questions

Find by tourist destination