| 摘要 |
A wiring board is formed with a substrate designating either the upper surface or the lower surface as a first surface and the other as a second surface; an electronic component arranged inside the substrate; and a first conductive layer formed on the first-surface side of the substrate by means of a first insulation layer made up of a first lower insulation layer and a first upper insulation layer. In such a wiring board, the first lower insulation layer and the first upper insulation layer are made of different materials from each other. Moreover, the first lower insulation layer is positioned on the first surface of the substrate and the electronic component, and the material that forms the first lower insulation layer fills a clearance between the substrate and the electronic component.
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