ELECTRIC POWER STEERING DEVICE

The invention includes an electric motor that causes a vehicle steering device to rotate, and a control unit that controls the electric motor, wherein the electric motor has a stator including two independent sets of coil winding group, the control unit has a control portion that computes and outputs a control amount and a drive circuit that independently drives each winding group of the electric motor, and the control portion detects a multiple of failures, categorizes the failures into at least two kinds of failure mode, continues control on a normal side after detecting a first failure, and continues control by employing a set in which control nearer to that at a normal time can be carried out, including a past failure, when detecting a second or subsequent failure.