PURPOSE: To provide a drainage joint capable of turning drain flowing in from a cross main pipe while dropping the drain smoothly into the downstream part riser.

CONSTITUTION: The lower part of a cylindrical joint body 1 is diametrally contracted to the funnel-like form and provided with a connection part 2 connected to a drain riser, while the upper part is provided with a vent port 31. Also, the joint body is provided on the inner peripheral wall with a turning groove 11 bulging in the outer peripheral direction, and a joint pipe 4 is connected to the turning groove 11 from the tangential direction to communicate thereto. Thus, drain flowing in from a cross main pipe can be smoothly dropped into the downstream riser.