To provide a connecting mechanism for a linear member capable of conveniently assembling various pipes for constituting a guardrail, a fence or a handrail in a desired form.

This connecting mechanism includes a disk-like or annular central body, a socket member 6 having one end connected to the central body and extends in the radial direction of the central body and having the other end connected to the linear member such as a pipe P, a wire or a bar, and a rail means arranged in a connecting part of the central body and the socket member 6 for moving the socket member 6 along an outer peripheral surface of the central body in a state of connecting its one end to the central body.