PURPOSE: To fit to tile joints easily by fitting a joint drainage tube to the through-hole of a tube main body, and providing movable a movable body which has a projecting connection tube between an installing tube installed to the lower side of the tube main body and the bottom surface of the tube main body.

CONSTITUTION: To a tile housing plate 23 fitted to the rectangular receiving frame 22 of a joint drainage tube 2, a tile same as a floor tile is fitted and installed. While the joint drainage tube 2 is fitted to the through-hole 11 of a tube main body 1, the central, the lateral, and the longitudinal joints of the tiles in the tile housing plate 23, and the joints of the floor tiles are fitted, and such a condition is maintained. Furthermore, by moving a movable body 3 provided between the tube main body 1 and an installing tube 4, the center of a projecting connection tube 31 is fitted to the center of a sewage branch tube, and the tube 31 is fitted and connected to the branch tube.