To provide a bathroom stool preventing the buttocks from getting chilly in use and stabilized when seating.

The seat part 14 of this bathroom stool 10 has a recessed shape and is formed of a substantially rectangular base part 25, a back face part 24 rising from the rear edge of the base part 25, side face parts 23 rising from the both side edges of the base part, and a front part 26 rising from the front edge of the base part 25. The base part 25 has openings 17a and 17b having such positions and dimension as being closed by the buttocks 72 when seating thereon. After pouring hot water to the seat part 14, the water used in a seating position is retained there to prevent the buttocks 72 from getting chilly. In non-use, the hot water is completely drained through the openings 17a and 17b so as to retain the cleanliness.