The present invention relates to an air vent for a vehicle, provided with a damper for opening or closing the air path of a duct housing with improved operation quality and convenience. The air vent for a vehicle comprises: a duct housing (20) having an air path inside, a vane member for adjusting air discharge direction, a damper (21) for opening or closing the air path and a cover fixing boss (22) formed in an outside surface; a dial knob (30) rotationally coupled to the duct housing (20) and having a knob coupling hole (31); a damper rotation member (40) coupled to a damper (21) rotation shaft and having a pinion gear (41); a knob connector (50) having protruded coupling members (51), of which one is fitted into the knob coupling hole (31); a damper connector (60) link-connected to the knob connector (50), provided with a rack gear (61) to be engaged with the pinion gear (41), and having a guide hole (62) placed by the cover fixing boss (22) of the duct housing (20); and a guide cover (70) having an insertion part (71) fitted with the cover fixing boss (22), and a finishing part (72) coupled to the cover fixing boss (22) by a coupling member (73).