Disclosed is a two-piece clip comprising a grommet and a pin. The grommet is provided with: a flange; a leg extending cylindrically from the bottom surface of the flange; an insertion hole that goes from the flange through the leg and into which the pin can be inserted; and a slit that divides the leg into a spreadable plurality of segments. The pin is provided with: a head having a larger outside diameter than the insertion hole; and a shaft that extends from the bottom surface of the head and that, upon insertion into the insertion hole, spreads the segments. The shaft is provided with a temporary attachment part that curves and protrudes radially outwards from the tip of the shaft and that elastically abuts against the top inner rim of the insertion hole.