Patent ID: 6883231

Claim:
A method for fabricating a circuit device, comprising the steps of: preparing an insulation resin sheet for which a first conductive layer and a second conductive layer are adhered to each other by insulation resin; forming through holes in said first conductive layer and said insulation resin at appointed points of said insulation resin sheet, and selectively exposing the rear side of said second conductive layer; forming multi-layer connecting means in said through holes and electrically connecting said first conductive layer and said second conductive layer; etching said first conductive layer to an appointed pattern and forming a first conductive path layer; adhering and fixing semiconductor elements by electrically insulating the same on said first conductive path layer; overcoating said first conductive path layer and said semiconductor elements with a sealing resin layer; etching said second conductive layer to an appointed pattern after etching the entire surface thereof so as to become thin, and forming a second conductive path layer; and forming external electrodes at appointed points of said second conductive path layer.