Patent ID: 7642652

Claim:
A method of manufacturing a semiconductor integrated circuit device, comprising the steps of: (a) forming a first insulating film over a semiconductor substrate; (b) forming a first wiring trench in the first insulating film; (c) forming a first wiring line in the first wiring trench, the first wiring line including a first conductive film comprised of a copper material as a main component; (d) forming a second insulating film over the first wiring line and the first insulating film; (e) forming a contact hole in the second insulating film; (f) forming a resist film over the second insulating film and in the contact hole such that the contact hole is filled with the resist film; (g) after the step (f), forming a mask layer over the resist film, (h) after the step (g), by using the mask layer as a mask, etching the resist film and the second insulating film to form a second wiring trench in the second insulating film; (i) after the step (h), removing the resist film and the mask layer; and (j) after the step (i), forming a second wiring line and a plug in the second wiring trench and in the contact hole.