Patent ID: 8530755

Claim:
A wiring board, comprising: a core insulation layer having a hole and a connection conductor formed in the hole of the core insulation layer, the connection conductor of the core insulation layer comprising a plating filling the hole of the core insulation layer; and an interlayer insulation layer laminated on one side of the core insulation layer, the interlayer insulation layer having a hole and a connection conductor formed in the hole of the interlayer insulation layer, the connection conductor of the interlayer insulation layer comprising a plating filling the hole of the interlayer insulation layer, wherein the connection conductor of the interlayer insulation layer is stacked on the connection conductor of the core insulation layer, the connection conductor of the core insulation layer has a land portion formed on the core insulation layer and comprising a metal foil and a plating on the metal foil of the land portion on the core insulation layer, the connection conductor of the interlayer insulation layer has a land portion formed on the interlayer insulation layer and comprising a metal foil and a plating on the metal foil of the land portion on the interlayer insulation layer, and the metal foil of the land portion on the core insulation layer has a thickness which is thicker than a thickness of the metal foil of the land portion on the interlayer insulation layer.