A pipe joint has a joint main body, a union nut connected to the joint main body, and a lock ring. The lock ring has a tubular wall, and a first axial end and a second axial end of the tubular wall are deformable by inner walls of tapered hole portion of the joint main body and the union nut. The lock ring has a first tapered opening portion providing a first groove for receiving a first end of a first pipe member and a second tapered opening portion providing a second groove for receiving a second end of a second pipe member, in a radial inside of the tubular wall. A radial outer surface of the first tapered opening portion and a radial outer surface of the second tapered opening portion are tapered such that the first groove and the second groove are narrowed toward its ends, respectively.