An attachment structure for a clip including a mounting member, a retaining hole formed in the mounting member, and a rib. An elastic retaining piece of the clip, while elastically deformed, is inserted into the retaining hole from an outer side of the mounting member toward an inner side to be retained therein. The rib is disposed around the retaining hole and is formed integrally with the mounting member. The rib includes a first rib formed on the inner side of the mounting member and a second rib formed outside, and concentric to, the first rib. The first rib has a thickness such that a clip press-contacting piece abuts the outer side of the mounting member when the elastic retaining piece is inserted in the retaining hole and retained on the rib, and the second rib has a thickness larger than the thickness of the first rib.