The present invention provides an electric power steering device designed so that during automatic steering mode, the steering of a steering wheel by a driver is detected by steering torque from a torque sensor, a switch to manual steering mode is made at a capacity (integral value) corresponding to the magnitude of generated torque, and no discomfort is imparted to the driver. The electric power steering device comprises a steering angle control unit for calculating a motor current command value (2), a torque integration determination unit for outputting a steering torque determination signal by integrating the steering torque and performing a comparison against a threshold, and a switching unit for inputting motor current command values (1, 2) and performing switching according to a switch signal or a steering torque determination signal. The torque integration determination unit is configured from a torque value comparison unit, a torque-sensitive or motor-state information gain unit, an integral calculator, and a switch determination unit. The switching unit is switched according to the steering torque determination signal or a command to switch between automatic steering mode and manual steering mode.