Patent ID: RE44251

Claim:
A board for mounting electronic circuit parts, comprising: a first connection terminal group including a plurality of connection terminals formed over a top surface of a substrate having through holes formed therein; a second connection terminal group including a plurality of connection terminals formed at over a peripheral portion of a back surface of said substrate, said first connection terminal group being connected to said second connection terminal group by way of said through holes; and a build-up multilayer interconnection layer formed on said top surface of said substrate and including at least one conductor layer and at least one insulator layer alternately stacked one on another, said at least one insulator layer having a plurality of via holes for electric connection of said at least one conductor layer electrically connected to said through holes, said first connection terminal group being densely formed on an outermost layer of said build-up multilayer interconnection layer, and said second connection terminal group being discretely formed at the peripheral portion of the back surface of said substrate.