Yunohana Chaya Shinzaemon no Yu

Shinzaemon no Yu is a day-use bathhouse where visitors can try Zao Onsen’s strongly acidic sulfur springs without booking a night at a ryokan. The complex combines indoor and outdoor baths with resting rooms, a shop and a restaurant. Zao is considered one of Yamagata’s historic hot-spring sources—the local association describes a tradition of about 1,900 years—and its mineral scent and acidity set it apart from a mild bath. The visit includes both bathing and the slower resting culture of the town.

The facility describes outdoor baths supplied with natural hot-spring water and several indoor options, including alternatives for people with sensitive skin. Admission is ¥1,000 for adults and ¥400 for children; under-threes pay ¥200. The restaurant serves regional dishes such as soba, Yamagata beef and imoni, and tatami rest rooms are available. The outdoor footbath closes in winter, while the restaurant does not follow exactly the same schedule as the baths. Hours can change on holidays or for maintenance.

Visitor reviews often value the clean facilities, water temperature and mineral strength, the choice between indoor and outdoor bathing, and the proximity to the lifts. Common reservations include busy changing rooms at peak times, a higher fee than the village’s small public baths, and water that may irritate sensitive skin. These comments should not be turned into a health promise: the spring is strongly acidic, so each visitor should keep the soak appropriate to their comfort. Check the tattoo policy and bring personal toiletries if needed.

The address is 905 Kawamae, Zao Onsen, a short walk from the ropeway area; the telephone number is +81 23-693-1212. It opens from 10 am to 6 pm, last admission 5:30 pm, and closes Wednesdays; the restaurant closes Wednesdays and Thursdays. A bus from Yamagata Station reaches Zao Onsen in about 37–40 minutes, and the walk from the terminal passes through the hot-spring street. To combine it with the Chuo Ropeway, ride early, return to town and leave time to bathe, eat and rest.