To provide a hot-spring curing auxiliary tool by which the depth can be adjusted as desired in the bath and a bather can enjoy bathing by allowing the bather to rotate a seat while sitting, for solving a problem that a bather cannot stay in a bath because a bath has a constant depth for hot-spring curing of legs and a waist and a whole body is dipped in the bath.

The hot-spring curing auxiliary rotary chair for adjusting depth is constituted so that a male screw support is set on the bottom part of a seat base (1) and is screwed into a female screw (6) on the center part of a tripod support to enable vertical movement and rotation of the seat (1), wherein the chair is formed in a tripod for stable sitting and uses a somewhat heavy material in spite of the small size.