PURPOSE: To provide a collective drainage joint by which drain water falling from a vertical drain pipe and drain water flowing in from a horizontal pipe are joined smoothly to fall.

CONSTITUTION: The upper part of a cylindrical joint main body 30 is contracted in the diameter, and an upper joint 31a to be connected to a vertical drain pipe 4 on the upper stream side, is provided, while a lower joint 31b to be connected to the vertical drain pipe 4 on the lower stream side is provided by contracting the lower part of the joint main body 30 in the diameter into a funnel shape. A cylindrical body 33 hung in the joint main body 30 from the upper joint 31a is provided, and the cylindrical body 33 is formed into a tapered form contracted in the diameter from above to downward. A branch joint 32 to be connected to a horizontal pipe 2 from the tangential direction is provided on the side wall of the joint main body 30. Since drained water fallen from the vertical pipe on the upper stream side and drained water flowing in from the horizontal pipe are smoothly joined to fall, no failure in passing water is generated.