A clip comprises a pin, and a hollow bush adapted to receive the pin therein. The bush includes a flange and a bush body having an opening which is formed by partially cutting off a peripheral wall thereof and adapted to receive therein a pin shank in a direction orthogonal to an axial direction of the bush body. The bush body and the bush flange are adapted to be expanded in a radially outward direction of the bush body about a position opposed to the opening, in a hinged manner. The pin has a shank that includes a protruding portion which has a narrow region formed near a distal end of the pin shank, causing no expansion in an outer diameter of the bush body in the radially outward direction when the pin is in a non-fastened position, and a wide region adjacent to the bush flange, causing an expansion in the outer diameter of the bush body when the pin is in a fastened position.