An air cleaner includes a flying body having a main body unit in which a control unit controlling flying movement is stored, and a propeller disposed around the main body as propulsion for floating the flying body; and a dust collector connected to the flying body, and including an intake opening and an exhaust opening. The propeller is disposed inside or under the dust collector, the dust collector electrostatically attracts dust in air flowing from the intake opening, and the flying body is a drone structured so that the propeller takes in air from an upper side and exhausts the air to a lower side.