Patent ID: 7994431

Claim:
A substrate with a built-in electronic component, comprising: a substrate on which a first conductive pattern is formed; an electronic component mounted on the first conductive pattern; an insulating layer covering the electronic component and formed by stacking a plurality of resin layers, each resin layer including an additive material in a different additive ratio; a second conductive pattern formed on the insulating layer; and a conductive columnar electrode for connecting the first conductive pattern to the second conductive pattern, wherein the insulating layer includes a first resin layer formed on the first conductive pattern, a third resin layer on which the second conductive layer is formed, and a second resin layer formed between the first resin layer and the third resin layer, the second resin layer is thicker than the first resin layer and the third resin layer, and the second resin layer is greater than the first resin layer and the third resin layer in terms of an additive ratio of the additive material.