Patent ID: 7902539

Claim:
A semiconductor device comprising: a field effect transistor provided on a semiconductor substrate; a first interlayer insulating film for covering said field effect transistor; a second interlayer insulating film for covering said first interlayer insulating film; a phase change element having a phase change film capable of carrying out a phase change into a crystalline state and an amorphous state by a main current of said field effect transistor; and a multilayer wiring layer provided on said semiconductor substrate, wherein a lowermost layer wiring of said multilayer wiring layer is provided on said second interlayer insulating film, said first interlayer insulating film has a plurality of first layer contact plugs which penetrates said first interlayer insulating film and is provided in contact with first and second diffusion layers of said field effect transistor, said second interlayer insulating film has a plurality of second layer contact plugs which penetrates said second interlayer insulating film and is provided in contact with said lowermost layer wiring, and said phase change element is provided on said first interlayer insulating film and has a lower surface provided in contact with an end face of a first plug in said plurality of first layer contact plugs which reaches said first diffusion layer, and a second plug in said plurality of first layer contact plugs which reaches said second diffusion layer and a third plug to be one of said plurality of second layer contact plugs are directly connected to each other, thereby constituting a stacked plug.