Patent ID: 9693451
Date: 2017-06-27
CPC Classifications: H05K

Claim:
1. A wiring board, comprising: an inorganic insulating layer; a first resin layer on one main surface of the inorganic insulating layer; a second resin layer on another main surface of the inorganic insulating layer; a conductive layer partially on one main surface of the second resin layer, the one main surface being on an opposite side to the inorganic insulating layer; and a third resin layer formed by covering the conductive layer on the one main surface of the second resin layer, wherein the inorganic insulating layer comprises a plurality of first inorganic insulating particles which are bound to each other at a part of each of the first inorganic insulating particles, and gaps which are surrounded by the plurality of first inorganic insulating particles, a part of the first resin layer and a part of the second resin layer are located inside the gaps, the third resin layer is made of a resin material which is the same as that of the second resin layer, the third resin layer comprises the plurality of filler particles, the plurality of filler particles are dispersed in the third resin layer, and a content ratio of the plurality of filler particles in an area of a side of the conductive layer is smaller than that of the plurality of filler particles in an area of an opposite side to the conductive layer in the third resin layer.