A semiconductor device includes a substrate including a fin-shaped active region that protrudes from the substrate; a gate insulating film covering a top surface and both side walls of the fin-shaped active region; a gate electrode on the top surface and the both side walls of the fin-shaped active region and covering the gate insulating film; one pair of insulating spacers on both side walls of the gate electrode; and a source region and a drain region on the substrate and respectively located on sides of the gate electrode. The source region and the drain region form a source/drain pair. The one pair of insulating spacers include protrusions that protrude from upper portions of the one pair of insulating spacers toward the gate electrode.