To provide an electric power steering control device capable of continuing an assist function by precisely computing an alternative torque value at the failure of a torque sensor.

This electric power steering control device of a vehicle to give steering torque to a steering mechanism by energizing and driving an electric motor in accordance with operation of a steering handle of a driver is furnished with the torque sensor including a torsion bar to detect steering force of the steering handle, a first rotation angle detection means to detect a rotation angle of a steering shaft to connect steering and the one end side of the torsion bar to each other, a second rotation angle detection means to detect a rotation angle of a pinion shaft to connect the other end side of the torsion bar and a pinion to each other and an abnormality detection means to detect abnormality of an output signal of the torque sensor, and has an alternative torque detection means to detect steering force of the steering in accordance with the rotation angle of the steering shaft and the rotation angle of the pinion shaft in the case when the abnormality of the torque sensor is detected by the abnormality detection means.