Patent ID: 7772109

Claim:
A manufacturing method of a wiring substrate, comprising: a substrate preparation step of preparing a substrate having a first region in which a first multilayer wiring structural body comprising plural insulating layers and wiring patterns is formed, and a second region in which a second multilayer wiring structural body comprising plural insulating layers and wiring patterns is formed, the second region being disposed in a position spaced apart from said first region; a first and second multilayer wiring structural body formation step of simultaneously forming the first multilayer wiring structural body and the second multilayer wiring structural body on both surfaces of the substrate; a connection step of folding the substrate so as to oppose the first multilayer wiring structural body to the second multilayer wiring structural body and electrically connecting the first multilayer wiring structural body to the second multilayer wiring structural body; and a substrate cut step of cutting the substrate so that the substrate corresponding to the first and second regions is separated from the substrate of the folded portion.