An electric power steering apparatus is provided in which stably performing drive of FETs of an inverter can be achieved by means of a simplified constitution. The electric power steering apparatus drive-controls a motor through an inverter comprised of an FET bridge based on each-phase duty command values of pulse-width modulation (PWM) and perform assist control of a steering system. The electric power steering apparatus comprises a charge pump circuit and a bootstrap circuit that generate a booster power voltage for driving upper-FETs of the FET bridge, wherein the circuit having a higher voltage is used as the booster power voltage.