An air purifier performing an air purifying operation by drive of an air blower, and the air purifier includes: a housing in which an inlet and outlets and are opened； an air passage that connects the inlet and the outlets and； the air blower that is disposed in the air passage； a pre-filter that is disposed so as to face the inlet； and an operation panel that has a plurality of touch keys to and a plurality of light sources which correspond to the respective touch keys, in which a human body detection unit that detects presence/absence of a person is provided in the housing, and an LED of a predetermined touch key of a first group is turned off when a person is not detected by the human body detection unit, and is turned on or blinks when a person is detected by the human body detection unit.
