To easily construct air piping by fitting a piping fixture clip to the water drain rising part of a waterproof pan and connecting both the ends of air piping, around which the piping holding part of the piping fixture clip is wound, to an air pump and an air bubble jetting nozzle.

Concerning an air bubble jetting bathtub 10, plural air bubble jetting nozzles are arranged on the bottom wall of a bathtub 2, an air pump 5 is installed at a lower part near the bathtub 2 inside a house K, and air piping 6 is connected between the air pump 5 and the air bubble jetting nozzles on the bathtub 2. The air piping 6 is held by a piping fixture clip 7 fitted to the water drain rising part, which is formed on the other side excepting for one side facing an adjacent floor pan, on a bathtub receiving member 31 at a waterproof pan 3 in order to erect a wall panel 4. After the waterproof pan 3 is fitted by temporarily winding the air piping 6 around the piping holding part of the piping fixture clip 7, the piping fixture clip 7 is fitted and fixed into the water drain rising part of the bathtub receiving member 31.