To provide a chair for a bathtub having a high mechanical strength, being sanitary and exerting favorable acting effect by abutting on the body of a user.

This chair 1 for a bathtub is provided with a carbon panel 11 casted of graphite, and a chair body 10 for the bathtub having a recessed part 10a where the carbon panel 11 is fitted in its upper face. The carbon panel 11 has the high mechanical strength, being sanitary and exerts the favorable action effect by far-infrared rays irradiated by abutting on the body. The carbon panel 11 is coated with resin containing a silver component.