There is only one super sento and natural hot spring facility in Oiso Town, Shonan: “THERMAL SPA S.WAVE” located inside the Oiso Prince Hotel!
This article introduced a complete list of information, from the location of this hot spring facility to its unique features.

▼Here are all the super sento & natural hot springs across the entire Shonan area!
＞＞[2026] Shonan Area Hot Springs & Super Sento Guide

THERMAL SPA S.WAVE (Oiso Prince Hotel)

　The large public bath and sauna at Oiso Prince Hotel are luxurious facilities designed to provide relaxation and healing, especially known for their breathtaking ocean views.

Large Public Bath
　The hotel’s large public bath is spacious, offering panoramic views of the beautiful ocean through its large windows. While soaking in the bath, guests can enjoy the stunning blue sea stretching to the horizon and the changing colors of the sky throughout the day. The sunset view is especially spectacular, combining the warmth of the hot spring with a truly relaxing atmosphere. In addition to the indoor bath, there is also an open-air bath where guests can listen to the sound of the waves and feel the refreshing ocean breeze.

Sauna
　The sauna also offers magnificent ocean views. In the dry sauna, guests can warm their bodies in high-temperature dry air while enjoying the relaxing sea view through the windows. The mist sauna features moderate humidity and lower temperatures, allowing guests to sweat gently while enjoying the same beautiful ocean scenery.

　Both facilities provide not only physical and mental relaxation, but also unforgettable moments thanks to the spectacular views spread out before guests.

Overview

■Links:
>>Official Website
>>Sauna Ikitai
>>Nifty Onsen
■Business Hours: 6:00 AM – 12:00 AM
(Last admission for day visitors: 5:00 PM / Last admission for hotel guests: 11:30 PM)
■Closed: Open year-round
■Open-Air Bath: Available
■Sauna: Available (Average temperature: 89°C)
■Cold Bath: Available (Average temperature: 20°C)
■Towel Rental: Free
■Dining Facilities: Available
■Rest Area: Available
■Admission Fees:
※Day-use access is available only through the plans below. Spa/hot spring-only day use is not available. Hotel guests can use the hot spring free of charge.

【Hot Spring & Spa】
① SPA & LUNCH
A plan to enjoy the daytime spa after lunch.
・S.DINING Semi-Buffet + Spa until 5:00 PM: ¥8,000
(SEIBU PRINCE CLUB Members: ¥7,700)
・Chinese Restaurant S.O Lunch Course + Spa until 5:00 PM: ¥8,000
(SEIBU PRINCE CLUB Members: ¥7,700)

② SPA & DINNER
A plan to enjoy the spa before or after dinner.
・S.DINING Semi-Buffet + Spa: ¥11,000
(SEIBU PRINCE CLUB Members: ¥10,500)
・Chinese Restaurant S.O Hisui Course + Spa: ¥11,000
(SEIBU PRINCE CLUB Members: ¥10,500)

③ SPA & Afternoon Tea
A plan to enjoy the spa from sunset into the evening after afternoon tea.
・Afternoon Tea + Spa until 12:00 AM: ¥9,200

④ SPA, Spa Treatment & LUNCH
A relaxation plan including lunch, a treatment at “SEA VOYAGE SHONAN SALON,” and spa access.
・S.DINING Semi-Buffet + Argan Oil Body Treatment + Spa until 12:00 AM: ¥20,350
・Chinese Restaurant S.O Lunch Course + Argan Oil Body Treatment + Spa until 12:00 AM: ¥20,350

⑤ Hot Spring & Lunch Set
A plan to relax in the hot spring after a Chinese cuisine lunch.
・Chinese Restaurant S.O Lunch Set + Hot Spring until 5:00 PM: ¥4,800
(SEIBU PRINCE CLUB Members: ¥4,500)
・Japanese Restaurant Kaisan Lunch Set + Hot Spring until 5:00 PM: ¥4,800
(SEIBU PRINCE CLUB Members: ¥4,500)

■Credit Cards: Accepted
■Cashless Payments: Accepted
■Address: 546 Kokufuhongo, Oiso Town, Naka District, Kanagawa Prefecture, Japan

Photos

●Photo Source: Oiso Prince Hotel Official Website

Hot Spring

Sauna

Spa

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How was it?
This article introduced all the super sento and natural hot springs in Shonan and Oiso Town!

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▼The Japanese version of this article is here!
>>【2026年最新】湘南・大磯の「スーパー銭湯/天然温泉」一覧【完全版】