PROBLEM TO BE SOLVED: To provide a bath adapter which enables fine bubbles to be efficiently dispersed to the whole of the inside of a bathtub and has good maintenance performance.SOLUTION: The bath adaptor includes: a body 62 having a spouting port 65j through which hot water supplied from a bath outgoing pipe 29 is spouted to the inside of a bathtub 31 and an outgoing flow passages (63a, 65a) through which the hot water flows toward the spouting port 65j, and mounted on the wall surface of the bathtub 31 and a bubble generating device 67 disposed at the outgoing flow passages (63a, 65a) and having a porous body 67a discharging hot water flowing through the outgoing flow passages (63a, 65a). The bubble generation device 67 is structured to be flexibly attachable/detachable to/from the body 62, so that the fine bubbles can be efficiently dispersed into the bathtub 31 and also maintenance of the porous body 67a is facilitated.
