Patent ID: 7462566

Claim:
A method of manufacturing a semiconductor device including a step of forming a predetermined pattern in a process target film formed on or over a semiconductor substrate, said method comprising: a step of forming, on said process target film, a stacked hard mask film having a first film, a second film and a third film stacked therein in this order; a step of selectively dry-etching said third film through a first resist film having a first pattern used as a mask, while making use of said second film as an etching stopper, to thereby form said first pattern in said third film; a step of removing said first resist film; a step of forming, after removal of said first resist film, a second resist film having a second pattern on said stacked hard mask film and then selectively dry-etching said stacked hard mask film and said process target film in this order, while making use of said second resist film as a mask, to thereby form said process target film into said predetermined pattern; and a step of removing, after formation of said process target film into said predetermined pattern, said first film remained on said process target film.