A composite electric element includes a solid electrolytic capacitor and an electric element disposed on the solid electrolytic capacitor. A conductive plate, which is less resistive than an internal conductive layer, is connected to and covers the composite electric element. A current from a power source and its return current from an electric load flow across the internal conductive layer of the composite electric element in opposite directions. The composite electric element is disposed on a surface of a module substrate, and a slit is provided on the ground so that more current flows inside the electric element in opposite directions.