A dielectric film production process comprising a baking step in which a
dielectric film is formed by heating a precursor layer formed on a metal
layer, wherein the metal layer contains at least one type of metal
selected from the group consisting of Cu, Ni, Al, stainless steel and
austenitic nickel-chromium-based superalloy and during at least part of
the baking step the precursor layer is heated in a reduced pressure
atmosphere.