An electric power tool includes a main body provided with a drive unit and a power supply pack detachably attached to the main body and provided with a power supply unit serving as a power source for the drive unit. A first power supply pack in which a secondary battery is used as the power supply unit and a second power supply pack in which an electric double-layer capacitor is used as the power supply unit are selectively used as the power supply pack to be attached to the main body.
