Patent ID: 8168893

Claim:
A multilayer wiring board comprising: a multilayer wiring substrate having a concave portion which accommodates an electronic component, the multilayer wiring substrate comprising a plurality of insulation layers, a plurality of conductive circuits, a plurality of vias and an electromagnetic shielding layer, wherein the conductive circuits are separated by the insulation layers and electrically connected through the vias, the electromagnetic shielding layer comprises a plurality of electromagnetic shielding sub-layers and formed along one of a bottom surface and side surfaces of the concave portion in the multilayer wiring substrate, the electromagnetic shielding sub-layers include a surface layer which comprises at least one of a first metal material and a second metal material, the first metal material has a reflection loss of electromagnetic waves which is less than a reflection loss of electromagnetic waves of other ones of the electromagnetic shielding sub-layers, the second metal material has an absorption loss of electromagnetic waves which is greater than an absorption loss of electromagnetic waves of other ones of the electromagnetic shielding sub-layers, and the surface of the electromagnetic shielding sub-layers includes the surface layer which is roughened.