Kosenjyo
古戦場
Kosenjyo is a bathhouse and restaurant in Ichinoseki, Iwate. Alongside its artificial hot-spring baths, it has a kanpo (Chinese herbal) sauna added by the fourth-generation owner in August 2022, with self-loyly limited to three ladles. The women's side has a herbal sauna (Metos ZIEL) added in November 2022, using the owner's own herb blend. There is also a lava sauna with aroma-water self-loyly, a groundwater cold bath, and an outdoor air-bathing area. Admission is 900 yen for junior high school age and above.
| Address | 〒021-0041 岩手県一関市赤荻字堺78-2 |
|---|---|
| Nearest station | 一ノ関駅（西口からバス「若宮八幡」下車徒歩2分／一関ICから車1分） |
| Private / shared | Shared |
| Style | 漢方サウナ／薬草サウナ（サウナ室に漢方・薬草を常設、セルフロウリュ可・柄杓3杯まで） |
| Hours | 【入浴】AM10:00〜PM9:30／【食事】AM10:00〜PM8:30（定休日なし） |
| Opened | 2022（漢方サウナ増設。男湯2022年7月28日／女湯薬草サウナ2022年11月22日） |
| Price | 入浴 中学生以上 ¥900／小学生 ¥750／小学生未満 ¥400（GW・お盆・年末年始は繁忙期価格）。入浴＋お食事セット ¥1,500 |
| Information checked | 2026-08-24 |
Prices, hours and the herbs used are subject to change. Please confirm on the official site before visiting.
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