To provide a drain pipe joint capable of preventing wastewater, introduced from a second introduction port of another horizontal branch pipe connection part, from rushing into a first introduction port of one horizontal branch pipe connection part.

In a drain pipe joint 100, wastewater introduced from a first introduction port of one horizontal branch pipe connection part flows in a horizontal direction by an inertia force of the wastewater because the one horizontal branch pipe connection part is provided in such a manner as to communicate in the horizontal direction. On the other hand, since a virtual tangent line VLDT of a lower curved surface 157D of a second introduction port of another horizontal branch pipe connection part 150 is provided in such a manner as to pass through the lower side with respect to a lower end 145D of the first introduction port of the one horizontal branch pipe connection part, the wastewater introduced from the second introduction port of the other horizontal branch pipe connection part 150 flows along the lower curved surface 157D.