Patent ID: 7240431

Claim:
A method for producing a multilayer printed wiring board having a through-hole that penetrates a wiring board substrate, comprising: a plating resist film forming step of forming a plating resist film on a surface of the wiring board substrate, a through-hole forming step of forming the through-hole that penetrates the plating resist film and the wiring board substrate, a plating pretreatment step of performing a pretreatment for plating on a through-hole surface of the plating resist film and a wall surface of the through-hole, a through-hole conductor forming step of fonning a through-hole conductor on the through-hole surface of the plating resist film and the wall surface of the through-hole by a plating treatment, a plating resist film stripping step of stripping off the plating resist film, and a protrusion portion pressing step of pressing a protrusion portion of the through-hole conductor against the wiring board substrate.