A microwave oven using DC power which can endure strong vibrations and eliminate noise according to noise standards. The microwave oven includes at least one second choke coil (10) which is arranged outside a magnetron filter box (6) and connected in series to at least one first choke coil (8a) installed in the magnetron filter box (6). The choke coils (8a, 10) and a feed-through capacitor (9) constitute a low pass filter. <IMAGE>
