To ensure the safety of a bathing person without restricting the freedom of the person by preventing the entangling of hair at the suction port of a jet bathtub even with the occurrence of a situation where the head of the bathing person comes close to the suction port when a suction flow flux on a plastic cover front wall with which the bathing person is easily brought into contact is reduced by enlarging a suction flow speed on a cover side wall concerning a suction port structure where a plastic cover having suction holes is mounted on the suction port of the jet bathtub.

The suction port structure for a bathtub having a injection port and a suction port on the side wall part is provided. In the structure, an internal mesh cover 2 is incorporated into an external plastic cover 1 having a front wall 11 and side walls 12 and provided with a plurality of suction holes 111, etc., and 121, etc., on both walls to obtain a double cover A which is mounted to the suction port.