To suppress moaning generating in operation of an electric motor with simple structure in a steering column positioning device, with simple structure.

When voltage is applied to drive the electric motor according to a map indicating voltage to be applied to the electric motor driven to position the steering column for each steering column position, an actual measurement relation between the steering column position and a revolution speed of the electric motor, a waveform as an opposite phase with respect to the actual measurement relation is calculated, a mean value of motor revolution speeds with respect to the steering column position, a variation of the motor revolution speeds from the mean value is calculated for each steering column position based on the motor revolution speed at each steering column position of the opposite phase waveform and their mean value, and each variation is added to a voltage value at each steering column position of the map stored in a storage part to create a new map. A map in the storage part is updated by the new map.