Provided is a semiconductor device wherein chip size is reduced, while potential on the dummy word lines is fixed. The semiconductor device is provided with: a memory cell array including a plurality of memory cells, a plurality of word lines for controlling memory operations of the plurality of memory cells, and a plurality of dummy word lines that do not participate in memory operations of the plurality of memory cells; and a guard ring surrounding the memory cell array. The plurality of dummy word lines are electrically fixed to the guard ring.