A semiconductor device according to one embodiment includes a cell disposition region in which plural basic cells are disposed and a basic power supply wiring. In the cell disposition region are disposed a primitive cell connected to the basic power supply wiring and a high current consumption cell connected to the basic power supply wiring. Furthermore, in the cell disposition region are disposed regularly plural ordinary power switch cells that supply a first current to the primitive cell respectively. The power reinforcement cell including a power switch cell configured so as to flow a predetermined current to the high current consumption cell is disposed near the high current consumption cell.