Wiring board

A wiring board, comprising:

• a core board including a core main surface, a core rear surface, an accommodation hole opening at both of the core main surface and the core rear surface, a core board main surface side conductor disposed on the core main surface and a core board rear surface side conductor disposed on the rear main surface;
• a capacitor including a capacitor main surface, a capacitor rear surface, a plurality of via conductors penetrating between the capacitor main surface and the capacitor rear surface, a plurality of inner electrode layers connected to the plurality of via conductors and laminated with a dielectric layer interposed therebetween, a capacitor main surface side electrode disposed on the capacitor main surface and connected to an end portion of the plurality of via conductors at the capacitor main surface side, and a capacitor rear surface side electrode disposed on the capacitor rear surface and connected to an end portion of the plurality of via conductors at the capacitor rear surface side;
• a resin filler which fills a gap between the capacitor accommodated in the accommodation hole and the core board so as to fix the capacitor to the core board, said resin filler made of an insulating material;
• a first wiring laminated body comprising:
• a lowermost resin insulating layer laminated on the core main surface and the capacitor main surface, wherein said lowermost resin insulating layer is formed with the resin filler using the same said insulating material, whereby the resin filler and the lowermost resin insulating layer are formed as a single unit, and
• a structure in which an interlayer insulating layer and a conductor layer are alternately laminated on the lowermost resin insulating layer, wherein an integrated circuit element is mountable to the first wiring laminated body;
• and
• a second wiring laminated body having a structure in which an interlayer insulating layer and a conductor layer are alternately laminated on the core rear surface and the capacitor rear surface, wherein a motherboard is connectable with the second wiring laminated body,
• wherein the resin filler includes a main surface side wiring forming portion disposed at the core main surface and the capacitor main surface,
• wherein the resin filler includes a rear surface side wiring forming portion disposed at the core rear surface and the capacitor rear surface,
• wherein a main surface side connecting conductor is disposed on the main surface side wiring forming portion so as to connect the core board main surface side conductor to the capacitor main surface side electrode, which is connected to an end portion of the via conductor at the capacitor main surface side, and
• wherein a rear surface side connecting conductor is disposed on the rear surface side wiring forming portion so as to connect the core board rear surface side conductor and the capacitor rear surface side electrode, which is connected to an end portion of the via conductor at the capacitor rear surface side.