The present invention provides an air vent for a vehicle, including: a housing which has an air outlet to which a duct is connected; and a damper unit which is inserted into and installed in the housing so as to open and close the air outlet, in which the damper unit includes: a damper knob which has a through hole into which a duct boss, which protrudes on the duct, is inserted, and one side surface connected to a damper, and drives the damper while being rotated; and a knob rubber which is made of rubber, covers a partial region of the damper knob, and extends to an inner surface of the through hole so as to be inserted into the through hole.