Manufacturing method of semiconductor device

摘要

Technology capable of preventing the deterioration of the reliability of semiconductor devices caused by the gasification of a part of the material constituting a wiring substrate is provided. A wiring layer constituting a circuit pattern is formed over each of the front and rear surfaces of a glass epoxy substrate, and after the formation of a solder resist covering the wiring layer while exposing a part of the wiring layer and prior to a heat treatment (first heat treatment) at 100° C. to 150° C. for dehumidification, a heat treatment (second heat treatment) at 160° C. to 230° C. for gasifying and discharging an organic solvent contained in the material constituting a wiring substrate is performed for the wiring substrate.