An information recording/reproducing apparatus records and/or reproduces information with a card-like information recording medium in which a plurality of guide tracks are formed. The apparatus includes an optical head for recording or reproducing information along the guide tracks, a head moving device for moving the optical head to and from along the guide tracks, and a recording medium moving device for moving the recording medium in a direction perpendicular to the guide tracks. The recording medium moving device is an ultrasonic motor.