A semiconductor device includes a memory cell array that is divided into a plurality of memory cell mats by a plurality of sense amplifier arrays, and each of the plurality of memory cell mats includes a plurality of word lines and a test circuit for performing a test control to activate, at a time, a plurality of word lines included in each of a plurality of selected memory cell mats that are not disposed adjacent to each other in the plurality of memory cell mats. According to the present invention, the memory cell mats with the plurality of activated word lines are distributed. Therefore, as compared with many word lines activated in one memory cell mat, the load applied to a driver circuit for driving word lines and the load applied to a power supply circuit for supplying an operation voltage to the driver circuit are reduced. As a result, more word lines can be activated at the same time.