An adjusting apparatus for an electric power steering device includes a steering mechanism converting an input torque into a steering force and transmitting the steering force to wheels, a torque sensor outputting a torque detection signal according to an input torque, an electric motor applying a steering assist torque according to a torque detection signal output from the sensor, a sensor circuit changing output characteristics of the sensor, an actuator applying an input torque to the steering mechanism, a steering force meter actuating the motor via the sensor according to an input torque and measuring a steering force output by the steering mechanism, and a sensor output adjuster adjusting the output characteristic of the sensor circuit to approximate a steering force measured by the meter to an ideal value set in advance according to a deviation amount calculated based on a difference between the steering force and the ideal value.