Patent ID: 8891245

Claim:
A printed wiring board, comprising: a core substrate comprising an insulative base material and having a penetrating hole configured to accommodate an electronic component; a first conductive layer formed on a first surface of the core substrate; a second conductive layer formed on a second surface of the core substrate on an opposite side of the first surface of the core substrate; a first electronic component having an electrode and accommodated in the penetrating hole of the core substrate such that the electrode of the first electronic component faces the first surface of the core substrate; a first buildup structure formed on the first surface of the core substrate and on the first electronic component and including a pad configured to mount a second electronic component on the first buildup structure and a via conductor connected to the electrode of the first electronic component; and a second buildup structure formed on the second surface of the core substrate and on the first electronic component, wherein the electrode of the first electronic component has an upper surface facing toward the first surface of the core substrate, the first conductive layer has an upper surface facing away from the first surface of the core substrate, and the first electronic component is positioned in the penetrating hole of the core substrate such that the upper surface of the electrode of the first electronic component forms a gap which is set in a range of 20 μm or smaller with respect to the upper surface of the first conductive layer and that the first electronic component is tilted with respect to the first surface of the core substrate.