An embodiment of the present invention provides a PCB module comprising: a multilayer PCB assembly including a heat dissipation plate layer, and an upper PCB and a lower PCB which are attached to the upper surface and the lower surface of the heat dissipation plate layer, respectively; and an upper case and a lower case for covering the upper side and the lower side of the multilayer PCB assembly, respectively, wherein the heat dissipation plate layer includes a plurality of electrically insulating heat dissipation plates arranged on the same plane, and at least one of the plurality of heat dissipation plates comprises: a first heat pole in thermal contact with an electronic circuit element mounted on the upper PCB or the lower PCB; and a second heat pole in thermal contact with the inner surface of at least one of the upper and lower cases.