Patent ID: 8116066

Claim:
A method of manufacturing an electronic component built-in substrate including a structure in which an electronic component is mounted in a concave portion provided in a mounted body, comprising the steps of: preparing the mounted body including a first insulating layer and a stopper metal layer formed under the first insulating layer of a portion corresponding to a component mounting region and a second insulating layer formed under the stopper metal layer; obtaining the concave portion by penetration-processing the portion of the first insulating layer which corresponds to the component mounting region to form an opening portion, while using the stopper metal layer as a stopper, wherein the stopper metal layer is exposed such that the stopper metal layer covers a whole of a bottom part of the opening portion; mounting the electronic component on the stopper metal layer at a bottom portion of the concave portion in a state that a whole of the stopper metal layer is maintained, wherein the electronic component is a parallel-plate type passive component on an upper surface side and a lower surface side of which a connection terminal is provided respectively, and the connection terminal of the upper surface side is directed upward, the connection terminal of the lower surface side is electrically connected to the stopper metal layer, and the whole of the stopper metal layer is used as an electrode; forming a third insulating layer on the electronic component and the first insulating layer; forming a first via hole whose depth reaches the connection terminal on an upper side of the parallel-plate type passive component in the third insulating layer and, after the step of mounting the electronic component, forming a first via hole whose depth reaches the stopper metal layer in the second insulating layer; and forming a second wiring layer which is connected to the connection terminal on the upper side of the parallel-plate type passive component via the first via hole on the third insulating layer and, after the step of mounting the electronic component, forming a second wiring layer which is connected to the stopper metal layer via the first via hole on a lower surface of the second insulating layer.