Patent ID: 7186920

Claim:
A multi-layer flexible wiring board comprising a first flexible wiring board and a second flexible wiring board connecting each other, wherein the first flexible wiring board having: a first resin film; a first wiring film, a bottom face of which is embedded into the first resin film; a second wiring film, a bottom face of which is in contact with a surface of the first resin film; a second resin film formed on a surface of the first wiring film and a surface of the second wiring film, and at least one first opening is formed in a part of the second resin film where the first wiring film is disposed, at least one second opening is formed in a part of the second resin film where the second wiring film is disposed, the second flexible wiring board comprises a base film, and a wire on the base film, wherein a face of the second flexible wiring board at a side where the wire is disposed is located toward a face of the first flexible wiring board at a side where the second resin film is disposed, a first bump is arranged in the first opening, the wire of the second flexible wiring board is connected to the first wiring film by the first bump, a second bump is arranged in the second opening, the wire of the second flexible wiring board is connected to the second wiring film by the second bump.