Patent ID: 8466372

Claim:
A wiring board with a built-in electronic component, comprising: a core substrate having a penetrating hole formed in the core substrate; an electronic component accommodated in the penetrating hole in the core substrate, the electronic component having a surface; a conductive pattern layer formed on a first surface of the core substrate and including a first conductive pattern and a second conductive pattern, the conductive pattern layer having a surface; a through-hole conductor formed in the core substrate and electrically connected to the first conductive pattern; and an interlayer insulation layer formed over the surface of the conductive pattern layer, the surface of the electronic component, and the first surface of the core substrate, wherein the second conductive pattern is formed adjacent to a periphery of the penetrating hole, configured to frame the periphery of the penetrating hole, has substantially a same thickness as the first conductive pattern, and is configured to laminate, over the penetrating hole, a sheet for positioning the electronic component in the penetrating hole such that the surface of the electronic component and the surface of the conductive pattern layer are positioned on the sheet, the core substrate has a gap between the core substrate and the electronic component accommodated in the penetrating hole, and the gap is filled with a resin material.