Staying at adex Inn in Noboribetsu: One Room, Two Onsen Bathhouses

adex Inn’s appeal is easy to miss if you compare room prices alone. The stay includes its own source-fed sulfur bath as well as access to Dai-ichi Takimotokan’s five-spring, 35-bath complex. That makes it a different proposition from booking an ordinary room elsewhere and paying separately for a large day-use bath.

Two bathing options are included with an adex stay

The hotel’s own public bath uses sulfur spring water. Its current English and Japanese pages describe the water as fed directly from the source without filtration. The hotel also grants overnight guests access to the Grand Bath at Dai-ichi Takimotokan, where the hotel lists five spring types across 35 baths.

The published hours at Takimotokan are 4 a.m.–1 a.m. for the indoor baths and 4 a.m.–midnight for the open-air baths and sauna. Ask the adex front desk how to activate the sister-hotel access before setting off; access terms can differ from those for guests staying at Takimotokan itself.

This arrangement suits people who want the larger complex but do not need a traditional ryokan room or dinner service. If you expect to spend most of your time soaking, using both facilities may matter more than having a larger room. If you only want a single evening bath, you may not make enough use of the second property to value the inclusion.

The contrast is between convenience and variety. adex’s own bath is an easy option when you do not want to cross the street, while Takimotokan is the reason to stay here if trying several spring types matters. The five types listed by Takimotokan are sulfur, saline, acidic iron, bicarbonate and sulfate springs. Its bathhouse is a separate property included in the adex stay; those five types are not all supplied to adex’s own bath.

The source-water details published for Takimotokan should not be copied over to adex. The confirmed points for adex are that its bath uses sulfur spring water, is described as source-fed and unfiltered, and can leave mineral deposits known as yunohana. The hotel’s published pages do not provide an analysis that would support assigning Takimotokan’s pH or source temperature to adex’s bath.

The rooms are compact, and have showers rather than an onsen bath

adex Inn lists 47 Western-style rooms. Its English room page describes a simple twin at 22 m²; the Japanese page says every room has a shower room, Wi-Fi, a Simmons bed and the basic in-room equipment. It does not advertise guest rooms with private natural hot-spring baths.

Check-in is listed from 2 p.m. to 10 p.m., with checkout at 10 a.m. If your train or bus connection might bring you to the resort after 10 p.m., confirm late-arrival arrangements with the hotel before booking.

The main room categories are a single room of about 18 m² for one guest and a twin room of about 22 m² for two. Both are western-style, and the hotel does not list a room with a private natural hot-spring bath. A higher room rate should not be read as an upgrade to in-room bathing.

For families, check the booked room’s maximum occupancy before comparing child rates. The property has child-pricing terms, but its main room inventory is built around one- and two-person rooms, not extra beds for a larger family. Children aged seven and over are asked to use the public bath appropriate to the hotel’s bathing guidance. For younger children, check suitability and rules with both properties; Takimotokan’s spring waters include strongly acidic types.

The bath access is useful on departure day, too

The Japanese onsen page says guests may continue using the Takimotokan bath after checkout. The published access page does not spell out a fixed checkout-day cutoff, so confirm the permitted hours and where to leave luggage with the front desk rather than assuming the room remains available.

adex Inn sits in the central resort area near Jigokudani and the main street. JR Noboribetsu Station is about 15 minutes away by local bus or taxi. For train, airport-bus and Sapporo-bus connections, use the Noboribetsu access guide.

The hotel lists free parking for overnight guests during their stay. Do not assume that the same parking arrangement covers a long stop after checkout; follow the hotel’s current instructions if you plan to keep the car while using another facility.

The ground floor has a bakery and cafe rather than a traditional ryokan dining program. Breakfast or a meal plan is not a fixed inclusion across all bookings, so check the exact offer. This setup is handy if you would rather choose dinner in the resort, but it is a weaker match if you expect an in-house kaiseki dinner and a full two-meal stay. A 24-hour media lounge, drying room and coin laundry are practical extras for travellers using Noboribetsu as a base; they are separate from the bath offering.

Check tattoo rules with both properties

The rules available online do not clearly state a general tattoo policy for either shared bath. Ask adex about its own bath and Takimotokan about the included guest access separately; do not assume one answer covers both. If you need certainty before booking, get the policy confirmed before the free-cancellation deadline.

Who is adex Inn a good fit for?

It is worth comparing if you are travelling alone or as a pair, want to keep the room simple, and expect to use the sulfur bath plus Takimotokan’s larger complex. It is less suitable when you need a private in-room onsen, a family room for several people, a traditional dinner-and-breakfast stay, or a guaranteed tattoo arrangement. In those cases, the key question is whether the hotel features you would use justify the price difference between adex and a larger ryokan.

The stay guide’s seven-point editorial ratings are: bathing comfort 95, bath variety 99, upkeep 84, atmosphere 86, quiet 82, access 97 and value 99. These are the guide’s comparative ratings, not hotel-published scores.

If private natural hot-spring water inside the room is essential, compare Ryotei Hanayura’s in-room onsen rooms. For Takimotokan’s building choices and the room types that do have a private onsen bath, see the Dai-ichi Takimotokan stay guide; the spring comparison covers its day-use admission.

Sources

- [adex Inn: onsen facilities and Takimotokan access](https://www.adexinn.com/en-onsen) - [adex Inn: room types, amenities and check-in](https://www.adexinn.com/en-rooms) - [adex Inn: twin-room size and booking availability link](https://www.adexinn.com/en-top) - [adex Inn: Japanese onsen page, including post-checkout bathing note](https://www.adexinn.com/ja-onsen) - [adex Inn: access from Noboribetsu Station and the airports](https://www.adexinn.com/en-access) - [Dai-ichi Takimotokan: current bath and sauna hours](https://takimotokan.co.jp/en/spa/) - [Dai-ichi Takimotokan: guest access to adex Inn](https://takimotokan.co.jp/en/faq/)

Checked: September 28, 2026

Room rates and remaining inventory depend on date and booking plan. The hotel’s published access page does not provide live availability or a fixed nightly price; compare your actual dates and confirm bath-access instructions directly with the property.