Abstract: A tracking device performs tracking correction by moving a mobile objective lens of an optical system in the transverse direction of tracks on an optical memory card in accordance with the tracking error of the optical system relative to the optical memory card. The tracking device includes comparison means for determining whether or not tracking error information is within a predetermined standard range and for generating a direction signal that represents the direction for correction, correcting signal generating means for generating a correcting signal when the result of the determination conducted by the comparison means is negative, and retaining portion moving means for moving a retaining portion of the objective lens in the direction indicated by the direction signal in response to the correcting signal delivered from the generating means.