To provide a pipe fitting which improves workability in inspecting air tightness by incorporating a valve in the pipe fitting.

This pipe fitting comprises a valve incorporated, which opens and closes the flow passage provided in the socket body 1 of the pipe fitting provided with pipe connecting means for connecting a pipe 40, and the valve is provided with a valve seat 14, which is provided in the socket body 1, a valve body 16 that can close the flow passage by abutting on this valve seat 14, and an eccentric operation member 23 which opens and closes from the outside of the socket body 1. The flow passage 35, which is formed in the valve seat 14, is opened and closed by moving the valve body 16 by rotating this eccentric operation member 23.