a case;

a cover plate coupled to an upper end of the case, and configured to receive an object to be heated on an upper surface thereof;

a plurality of working coils disposed below the cover plate, and configured to heat the object to be heated;

at least one base plate disposed at a middle of the case, and provided with the plurality of working coils at an upper portion thereof;

an air blowing fan configured to cool an inside of the case;

a plurality of drive circuits disposed at a lower end of the case, and configured to drive each of the plurality of working coils;

a heat sink disposed over a portion of one of the plurality of drive circuits;

an air guide configured to guide air from the air blowing fan and disposed on the heat sink;

a plurality of filter circuits disposed at the lower end of the case, and configured to reduce noise generated by the plurality of working coils; and

a power feeder disposed adjacent to the plurality of filter circuits at the lower end of the case, and configured to be supplied with power from an external power source,

wherein the plurality of working coils includes a high-power working coil, at least one first low-power working coil, and at least one second low-power working coil disposed side by side with each other,

wherein the plurality of filter circuits and the power feeder are disposed below the at least one first low-power working coil,

wherein the plurality of drive circuits are disposed below the high-power working coil and the at least one second low-power working coil,

wherein the air guide comprises a plurality of filter air channels to directly cool the plurality of filter circuits,

wherein the plurality of filter circuits are disposed below any one of lateral sides of the at least one base plate, and wherein the plurality of drive circuits are disposed below the other of the lateral sides of the at least one base plate and below a central portion of the at least one base plate,

wherein the plurality of filter circuits include a first filter circuit configured to reduce noise generated by the high-power working coil, a second filter circuit configured to reduce noise generated by the at least one first low-power working coil, and a third filter circuit configured to reduce noise generated by the at least one second low-power working coil, and wherein the first, second, and third filter circuits are disposed in a single column in a direction orthogonal to the direction in which the high-power working coil, the at least one first low-power working coil, and the at least one second low-power working coil are disposed.