An air purifier includes a blower which selectively supplies air in a first direction and a second direction based on forward/reverse rotation, a first air vent located on the first direction side of the blower, a second air vent located on the second direction side of the blower, a purification filter located on an upstream side of the second air vent based on the second direction, a third air vent located on an upstream side of the blower based on the first direction, and a damper which opens/closes the third air vent.