Patent ID: 7132029

Claim:
A method for manufacturing a multilayer circuit board, comprising: disposing, on at least one surface of a circuit board including a wiring layer provided on both sides of an electrically insulating substrate, an uncured substrate which includes a core material including an uncured thermosetting resin layer and an uncured thermosetting resin layer on either surface of the core material, via holes being formed in a thickness direction of the uncured substrate, and a conductive paste having been filled into the via holes; layering a metal foil over the uncured substrate; compressing the multilayer circuit board in the thickness direction to alter the shape of the uncured substrate along recesses and projections caused by the wiring layer on the surface of the electrically insulating substrate; and subsequently performing hot pressing to electrically connect the metal foil on the uncured substrate and the wiring layer of the circuit board via a conductive substance obtained by thermally curing the conductive paste, wherein the conductive substance slightly projects above the uncured substrate, thus causing the metal foil positioned over the conductive substance to project outward in a range of 1 μm to 100 μm above the uncured substrate.