To provide a clip for installing a part such as a trim board of a car on a panel such as a door panel capable of installing the part by inserting the clips into the mounting holes of the part.

A mounting hole 220 of a part (for example, a trim board 200) is formed in a circular shape smaller than the flange part 110 of a clip 100. The mounting part 130 of the clip 100 comprises a column part 131 and at least a pair of fin parts 132. Each fin part 132 is extended spirally from the column part 131. A tapered part 133 is provided on each fin part 132. Each taper part 133 is inclined convergently. When coming in contact with the installation hole 220, the taper part is folded up so as to wind the fin part 132 on the column part 131 against the elastic force of each fin part 132.