An object is to provide a nonvolatile semiconductor memory device which is
excellent in a writing property and a charge retention property. In
addition, another object is to provide a nonvolatile semiconductor memory
device capable of reducing writing voltage. A nonvolatile semiconductor
memory device includes a semiconductor layer or a semiconductor substrate
including a channel formation region between a pair of impurity regions
that are formed apart from each other, and a first insulating layer, a
plurality of layers formed of different nitride compounds, a second
insulating layer, and a control gate that are formed in a position which
is over the semiconductor layer or the semiconductor substrate and
overlaps with the channel formation region.