Patent ID: 8198666

Claim:
A nonvolatile semiconductor memory device, comprising: a memory cell array comprising a nonvolatile memory element, comprising: a first island-like semiconductor region formed over a substrate, and having a first channel formation region, and a first source region and a first drain region including a first impurity element imparting conductivity; a first gate insulating film comprising a second insulating film over the first island-like semiconductor region; a floating gate electrode over the first gate insulating film; a second gate insulating film comprising a third insulating film over the floating gate electrode; and a control gate electrode over the second gate insulating film; and a driver circuit portion electrically connected to the memory cell array, comprising a transistor, comprising: a second island-like semiconductor region formed over the substrate, and having a second channel formation region, and a second source region and a second drain region including a second impurity element imparting conductivity; a third gate insulating film comprising a first insulating film over the second island-like semiconductor region and the second insulating film over the first insulating film; and a gate electrode comprising a first conductive film over the third gate insulating film and a second conductive film formed over the first conductive film, and electrically connected to the first conductive film, wherein the third insulating film is provided between the first conductive film and the second conductive film.