An electric power steering device includes a torque detector that includes a torque sensor and a control unit. When abnormality has not occurred in a torque signal, an output section in the torque sensor transmits a normal signal that is a value based on the torque signal and is between a second lower limit that is greater than a first lower limit and a second upper limit that is less than a first upper limit. When abnormality has occurred in the torque signal, the output section transmits a first fault notification signal that is a value between the first and second lower limits or a second fault notification signal that is a value between the first and second upper limits. The control unit identifies a fault and calculates an amount of assist for reducing steering torque based on a signal transmitted from the output section.