Patent ID: 8143531

Claim:
An electronic component mounting package comprising: a structure including a plurality of wiring layers stacked one on top of another with an insulating layer interposed therebetween and interconnected through via holes formed in the insulating layers, the structure having a first surface and a second surface opposite to the first surface; an interposer having a first surface on which an electronic component is to be mounted, and a second surface opposite to the first surface, the interposer being mounted with the second surface thereof facing the first surface of the structure; and a molding resin formed to cover the entire surface of the structure, exclusive of pad portions defined in outermost wiring layers on respective sides of the first surface and the second surface of the structure, wherein the molding resin is filled into a gap between the structure and the interposer, covers a side surface of the interposer and has a depression for mounting the interposer therewith the depression including a cavity such that the first surface of the interposer is on a level with a bottom surface of the cavity, and wherein the interposer is connected via a connection terminal to the pad portion on the first surface of the structure.