Patent ID: 8003160

Claim:
A method of manufacturing a wiring substrate comprising a substrate, an organic membrane formed on said substrate, and a metal wire formed on said organic membrane, said method comprising the steps of: forming said organic membrane on said substrate, said organic membrane being provided with a surface having pits and projections with an arithmetic mean deviation of profile of not less than 60 nm and not more than 5×10 −2 D, where D is the width of said metal wire, and with a contact angle with respect to water of not less than 110°, wherein D is not less than 30 μm and not more than 150 μm; applying a dispersion liquid containing metal microparticles to said organic membrane so that said dispersion liquid containing metal microparticles permeates at least some of said pits and projections; and heating the dispersion liquid that has been applied.