An air cleaner includes a blower configured to suction air from outside, filter the suctioned air, and discharge the filtered air, a flow adjusting device disposed above the blower and configured to suction the filtered air discharged from the blower, adjust a discharge direction of the filtered air, and discharge the filtered air in the adjusted discharge direction, and a guider disposed below the flow adjusting device and configured to move the flow adjusting device. The guider includes a first housing disposed above the blower and including a first housing gear, a second housing connected to the first housing, a second housing gear disposed in the second housing and configured, together with the first housing gear, to raise or lower the second housing, and a guide gear accommodated in the second housing and configured such that the flow adjusting device is moved in rotation by rotation of the guide gear.