A clip includes a grommet provided with a projecting portion and a plurality of leg portions, and a shaft member provided with a head portion and a shaft portion, and is switchable between a lock position where the shaft member is pushed into the grommet to expand a diameter of the leg portions, and an unlock position where the shaft member is pushed further into the grommet so as to return the leg portions to an original condition. In main portions, the leg portion includes a leg-side convex portion provided on an inside; a convex-portion wall face inclining in a leg-portion inward direction from a leg-portion tip side; and a guide portion extending to the leg-portion tip side from a leg-side-convex-portion forming portion in a state of being provided together with the leg-side convex portion, and inclining an extending tip side to the inside of the leg portion. The shaft portion includes a shaft-side convex portion engaging the leg-side convex portion to expand the diameter of the leg portion; a concave portion engaging the leg-side convex portion so as to return the leg portion to the original condition from a diameter expansion; an abutment portion abutting against the convex-portion wall face; and a release portion relative to the guide portion.