A clip includes: a head portion; and a leg portion including: a pair of first engagement arms that are provided on a pair of facing side surfaces of the leg portion; a pair of second engagement arms that are provided on the other pair of facing side surfaces of the leg portion, the pair of second engagement arms including abutment portions adapted to be individually brought into abutment with circumferential edges of respective diametrically extended hole portions of a trim and a panel; a pair of first stopper walls for holding a hole edge of the mounting hole of the panel in cooperation with the respective first engagement arms; and a pair of second stop walls for holding the circumferential edges of the diametrically extended hole portions of the panel in cooperation with the abutment portions of the respective second engagement arms.