To provide an air cleaner which, even when the air cleaner employs a cleaning function for which there is the potential for the exhibition efficiency of the function to be reduced by contaminants in the air, is capable of stabilizing the exhibition of that function. A body portion (2) includes suction openings (13, 14) and a blowout opening (12). A main air flow path interconnects the suction openings (13, 14) and the blowout opening (12). An air cleaning unit (40) is disposed on the main air flow path and cleans the air that passes therethrough. A bypass air flow path bypasses a space on the suction openings side of the air cleaning unit (40) and a space on the blowout opening side of the air cleaning unit (40) in the main air flow path. A streamer discharge unit (63) is disposed in the bypass air flow path and generates active species. A blowing fan (31) is disposed inside the body portion (2) and is driven to rotate, whereby the blowing fan forms a main air flow (F1) that leads from the suction openings (13, 14) to the blowout opening (12) in the main air flow path and a bypass air flow (F2) that leads from a space on the blowout opening (12) side to a space on the suction openings (13, 14) side in the bypass air flow path.
