To provide a support base for bathing capable of effectively restraining an infant when bathing.

The support base for bathing to be used when the infant is in bathing includes a base body for supporting the infant in a dorsal state. The base body is configured to have a one-way inclination state for use where a downward slope is formed from a part corresponding to the head part of the infant to a part corresponding to the leg part of the infant. A crotch support for restraining the hip part of the infant to the base body with the use of a crotch belt and hip belts to be engaged with the crotch belt is attached to the base body.