A semiconductor memory device is disclosed which includes an array of memory cells for storing data depending on whether current pull-in is present or absent or alternatively whether it is large or small, a plurality of sense lines with read data of the memory cell array transferred thereto, a reference sense line for common use in data sensing at the plurality of sense lines while being given a reference voltage for the data sense, and a sense amplifier array having a plurality of sense amplifiers for amplifying a difference voltage between the plurality of sense lines and the reference sense line to thereby determine read data.