Patent ID: 8829357

Claim:
A wiring board, comprising: a core substrate having an opening portion and a through hole adjacent to the opening portion; a capacitor positioned in the opening portion; and a through-hole conductor formed in the through hole of the core substrate and comprising a conductor filling the through hole, wherein the core substrate has a first surface and a second surface on an opposite side of the first surface, the opening portion of the core substrate penetrates from the first surface to the second surface, the through-hole conductor has a first conductive portion and a second conductive portion directly connected to the first conductive portion in the core substrate, the first conductive portion of the through-hole conductor becomes narrower from the first surface of the core substrate toward the second surface of the core substrate, the second conductive portion of the through-hole conductor becomes narrower from the second surface of the core substrate toward the first surface of the core substrate, the capacitor has an electrode having a side electrode portion, and the side electrode portion of the electrode bulges out further in a middle portion of the side electrode portion of the electrode than in end portions of the side electrode portion of the electrode in a thickness direction of the capacitor such that a distance between the through-hole conductor and the side electrode portion is substantially constant in a thickness direction of the capacitor.