Patent ID: 7371643

Claim:
A method of manufacturing a nonvolatile semiconductor memory device comprising: forming a floating gate of a memory cell and a first portion of a selection gate of a selection transistor on a semiconductor substrate, the floating gate and the first portion being made of a first conductive layer and formed on the semiconductor substrate, with a gate insulation film interposed, and the selection transistor being used for selecting the memory cell; forming source and drain regions of the memory cell in the semiconductor substrate; forming an inter-gate insulation film on an entire surface of a resultant structure; removing the inter-gate insulation films from at least one side wall of the selection gate; forming (i) first and second control gates of the memory cell which are arranged on both sides of the floating gate with the inter-gate insulation film interposed and (ii) a second portion of the selection gate which is adjacent to and electrically connected to the first portion of the selection gate, by depositing and flattening a second conductive layer.