The present invention relates to an air-cleaning machine for purifying air by an electric discharge operation. In order to remove accretions adhering to the electrodes when air is purified by performing corona discharge or streamer discharge, the air-cleaning machine is configured so that accretions are removed by applying on the electrodes a higher voltage than when performing the usual air purification electric discharge to perform spark discharge. The air-cleaning machine is provided with a control unit for executing the usual electric discharge operation, which purifies air by performing streamer discharge, etc., and an extreme electric discharge operation for performing spark discharge to remove accretions adhering to the electrodes. The control unit is configured so as to adjust the applied voltage so that the current value between a pair of electrodes in the electric discharge unit is constant and the upper limit (V) for the applied voltage is set to a value greater than (d) x 1.2, (d) being the distance between the two electrodes.
