Patent ID: 8227337

Claim:
A method of manufacturing a semiconductor device, comprising: forming an insulating film over a semiconductor substrate; forming main wiring portion laminated with a plurality of metal films on the insulating film; obtaining metal wiring composed of the main wiring portion and a metal protection film by forming the metal protection film made of a precious metal at least on an upper surface of the main wiring portion using a plating method; forming an interlayer insulating film on the metal wiring; and forming via holes reaching to the metal wiring by etching the interlayer insulating film, wherein the step of obtaining the metal wiring includes: forming a plating power-supply film on the main wiring portion and the insulating film; forming the metal protection film by means of electrolytic plating using the plating power-supply film as a power supply path; and leaving the metal protection film on the upper and side surfaces of the main wiring portion by selectively etching the metal protection film and the plating power-supply film in each region between the main wiring portions.