Abstract: A motherboard is shielded by way of a shielding metal sheet. A shielding metal sheet according to the invention is embodied such that the dimensions thereof in the longitudinal and transverse direction do not exceed the dimensions of the motherboard, thus advantageously allowing the shielding metal plate to be mounted directly on the motherboard. By directly mounting the shielding metal plate on the motherboard, the motherboard can also be transported or mounted on a main board as a unit along with the protecting shielding metal plate. The novel device is particularly suitable for decentralized parts production processes and finishing processes of entire shielded electronic systems requiring a lot of components, especially for applications in motor vehicles.