Patent ID: 8207572

Claim:
A nonvolatile semiconductor memory device, comprising: a first columnar protrusion and a second columnar protrusion formed to be separate on a surface of a semiconductor substrate, wherein said first and second columnar protrusions each include a split gate nonvolatile memory cell in which a first source/drain region and a second source/drain region are respectively formed at a surrounding part and an extremity, and in which a first layered structure, in which a charge accumulating film and a memory gate line are layered, and a second layered structure, in which a gate oxide film and a control gate line are layered, are formed on a surface of a sidewall between said surrounding part and said extremity, and said first layered structure is also formed between said first and said second columnar protrusions, whereby said memory gate line of said first columnar protrusion and said second columnar protrusion is connected each other.