PURPOSE: To partially reinforce a film carrier having flexibility by building a layer of a reinforcing material to arrest flexibility around the resin cladding and on the cladding itself of the film carrier which comprises two or three highly flexible layers.

CONSTITUTION: An opening 4a is formed in a preset part of a flexible film 4, upon which a group of lead wires 3a are formed with a conductor wiring 3 and part of it extending to the opening 4a, thereby forming a two-layer film carrier 9. Here, the size of the opening 4a is formed slightly larger than that of a semiconductor element 1 and, onto the opposite side of the surface on which this semiconductor 1 is mounted, a reinforcing material 6 having an opening 6a which is larger than that opening is glued with an adhesive 7 and fixed. As a result, high dimensional stability and improved flatness are obtained at the reinforced part.