A clip comprising: a grommet having a projecting portion, and a plurality of leg portions diametrically expandably extending from the projecting portion; and a shaft member including a head portion, and a shaft portion extending from the head portion, and inserted into an inside of the leg portions from a through hole provided in the projecting portion so as to expand a diameter of the leg portions, the clip being switchable between a lock position where the shaft member is pushed into the grommet for a predetermined amount to expand the diameter of the leg portions, and an unlock position where the shaft member is further pushed in so as to return the leg portions to an original condition, wherein each leg portion includes a leg-side convex portion provided on an inside; a convex-portion wall face forming one portion of the leg-side convex portion, and 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 thereof to the inside of the leg portion for easily inserting into an attachment hole for insertion of the leg portion, and 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 provided between the shaft-side convex portion and the head portion, and 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, characterized in that each leg portion has a relation wherein the leg-side convex portion of one leg portion and the guide portion on the other leg portion face each other, and the guide portion on one leg portion and the leg-side convex portion of the other leg portion face each other. a grommet having a projecting portion, and a plurality of leg portions diametrically expandably extending from the projecting portion; and a shaft member including a head portion, and a shaft portion extending from the head portion, and inserted into an inside of the leg portions from a through hole provided in the projecting portion so as to expand a diameter of the leg portions, the clip being switchable between a lock position where the shaft member is pushed into the grommet for a predetermined amount to expand the diameter of the leg portions, and an unlock position where the shaft member is further pushed in so as to return the leg portions to an original condition, wherein each leg portion includes a leg-side convex portion provided on an inside; a convex-portion wall face forming one portion of the leg-side convex portion, and 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 thereof to the inside of the leg portion for easily inserting into an attachment hole for insertion of the leg portion, and 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 provided between the shaft-side convex portion and the head portion, and 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, characterized in that each leg portion has a relation wherein the leg-side convex portion of one leg portion and the guide portion on the other leg portion face each other, and the guide portion on one leg portion and the leg-side convex portion of the other leg portion face each other.