Abstract: Proposed is a headliner air vent device for a vehicle. A housing includes a first outlet through which air is discharged and a second outlet comparted by an inner cover and having a configuration by which air is discharged through outside the first outlet. An air guide supporter is rotatable inside the housing. An air guide is positioned to face an outer cover by which the second outlet is defined. The air guide is configured to move upwards or downwards in response to rotation of the air guide supporter to selectively open or close the second outlet.

Abstract: In a slim air vent apparatus for a vehicle, since an external wing rotating in an up and down direction is provided per duct, the air vent may be configured to be compact and slim, and since both an internal wing and the external wing are located to be inserted inside the duct, a hidden feeling may be provided and an appearance may be improved. Furthermore, since a function is realized by manually operating a single knob located in the center portion of the external wing by a user, convenience of operation may be improved, costs may be reduced, and thus, the slim air vent apparatus for a vehicle may be universally applied.