A vent unit includes a bezel installed on a vehicle and formed in a ring shape with a flow hole at the center, and a spacer overlapping and coupled to the bezel and formed in a ring shape rotating relative to the bezel. The bezel has a plurality of first through-holes circumferentially spaced apart from one another, and the spacer has a plurality of second through-holes circumferentially spaced apart from one another such that conditioning air is discharged to an interior through the second through-holes and the first through-holes when the second through-holes are aligned with the first through-holes by circumferential rotation. The vent unit further includes a wing disposed in the flow hole of the bezel and coupled to the spacer through a hinge shaft. The wing controls discharge of conditioning air through the flow hole by axially rotating, and circumferentially relatively rotating together with the spacer.