A semiconductor device includes: a plurality of circuit parts; a global power source; a plurality of power source supply circuits; and a plurality of local power source control circuits provided in correspondence to the plurality of circuit parts, wherein each of the plurality of power source supply circuits includes a plurality of discrete supply switches, each of the plurality of local power source control circuits includes: a voltage monitor circuit; a storage circuit storing an output target characteristic value of the voltage monitor circuit; a comparator configured to compare the output characteristic value of the voltage monitor circuit and the target characteristic value; and a switch control circuit configured to control the number of the plurality of turned-on discrete supply switches based on the comparison result of the comparator.