Patent ID: 8418358

Claim:
A method for manufacturing a wiring board with a built-in component, comprising: preparing a core layer which includes an insulating board having an upper surface, a first wiring pattern provided on the upper surface of the insulating board, an electrode provided on the upper surface of the insulating board, and a solder resist provided on the upper surface of the insulating board and surrounding the plurality of electrodes; providing an electronic component having a solder bump; applying a flux on the electrode or the solder bump; placing the electronic component on the core layer such that the solder bump is placed on the electrode after applying the flux; forming a solder joining the electronic component to the electrode by melting and solidifying the solder bump, such that at least a part of the applied flux remains around the solder; cleaning the solder and removing at least the part of the remaining flux, putting and curing resin material between the electronic component and the core layer after said cleaning the solder; forming a sealing resin entirely covering the solder and the solder resist at a gap between the electronic component and the core layer; after said forming the sealing resin, roughening an upper surface of the first wiring pattern; providing a prepreg covering the electronic component and the roughened upper surface of the first wiring pattern; forming a layered structure by providing a metal foil on an upper surface of the prepreg; forming, by heating the layered structure, a component-fixing layer in which the prepreg fixes the core layer, the electronic component, and the metal foil; and forming an interlayer wiring connecting the first wiring pattern to the metal foil.