To provide an electric power steering apparatus of a compact structure having sufficient steering auxiliary force during stationary steering without increasing the scale of a system.

In an electric power steering apparatus connected to a steering system, including a motor 18 generating steering auxiliary torque to the steering system via a reduction gear, controlling the motor on the basis of a steering torque of the steering system or a vehicle speed, and generating steering assist torque, the reduction gear comprises first reduction gears 18b, 20 and second reduction gears 18c, 21 having different speed reduction ratios. The electric power steering apparatus includes a switching means 13 switching the first and second reduction gears 18b, 20, 18c, 21.