The paper analyzes the role of virtue in the Kantian ethics, starting with the study of the moral worth of an action and the role of virtue in the Groundwork for the Metaphysics of Morals (1785). Moreover, the paper investigates the conception of virtue in the Doctrine of the Virtue, which is the second part ofthe Metaphysics of Morals ( 1797). In this work, Kant defines virtue as moral strength of the will, which is necessary to act accordingly with the moral law. I prove that solely by the possession and exercising of virtue, it is possible to comply with the duties of virtue