Patent ID: 8338817

Claim:
A semiconductor device comprising: a first interlayer insulating film provided on a semiconductor substrate; a second interlayer insulating film 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, the phase change element being provided on said first interlayer insulating film; 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 formed in said semiconductor substrate, 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, said phase change element 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, 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, and a fourth plug in said plurality of second layer contact plugs is provided for connecting an upper surface of said phase change element and said lowermost layer wiring.