PURPOSE: To prevent the generation of exfoliation and cracks of the substrate of an electron part, and to prevent the disconnection of a wiring, a bonding wire and the like by a method wherein the rubber layer covering the electron parts is provided in such a manner that it does not come in contact with the sealed resin layer provided covering the electron parts.

CONSTITUTION: A sealed resin layer 9 is provided covering the electron parts 3, 4, 5 and 6 provided on a substrate 2. At that time, a rubber layer 7 is provided in such a manner that it covers the part 3, 4, 5 and 6 without coming into contact with the resin layer 9. Said rubber layer 7 consists of silicon rubber. As a result, the exfoliation of the parts 3, 4, 5 and 6 from the substrate 2, disconnection of a wiring, a bonding wire and the like can be prevented.