Patent ID: 7716825

Claim:
A method for manufacturing a printed wiring board which includes forming a thermosetting resin layer so as to fill spaces between circuit patterns formed on a surface of the printed wiring board, heating and curing the resin layer, and then polishing the cured resin layer covering the circuit patterns, thereby exposing the circuit patterns, wherein the step of heating and curing the resin layer comprises: maintaining the resin layer at a non-curable temperature range between 100° C.-140° C. where the resin layer is pressed via a smoothing plate in a reduced pressure environment; heating the resin layer in the pressed state to a curing temperature at which the resin layer is cured; introducing outside air into the reduced pressure environment while maintaining the pressed state and the curing temperature; reducing the pressure applied to the smoothing plate while maintaining the curing temperature; and cooling the resin layer, wherein a metallic foil with a roughened surface facing the resin layer is superposed on the resin layer.