To thoroughly prevent the disadvantage such as blow-off of water sealed in a trap by improving an offset joint in the case of offset piping a drainage riser of a building.

This joint is used for offsetting the riser in drain piping of a building. A drainage outflow side connecting part 2 to which a lower side vertical pipe A is connected is provided at the lower end of the joint main body 1 having the upper end closed, and a drainage inflow side connecting part 3 to which an upper side horizontal or obliquely upward pipe B is connected is provided at the side of the joint main body 1 through a guide passage 4 for making inflow drainage into a swirl flow along the inner periphery of the joint main body 1.