An electromagnetic wave absorption sheet is arranged to contact an upper surface and side surfaces of an electronic component mounted on a wiring board, a heat conduction plate is arranged to contact the electromagnetic wave absorption sheet, a heat transfer sheet is arranged to contact the heat conduction plate, and a heat dissipation member is arranged to contact the heat transfer sheet. Heat conductive particles contained in the heat transfer sheet contact a flat surface portion of the heat conduction plate. The electromagnetic wave absorption sheet, the heat conduction plate, and the heat transfer sheet are interposed between the heat dissipation member and the electronic component, as a heat conduction member for conducting heat generated in the electronic component and the like to the heat dissipation member.