The author attempts to construct a comprehensive theory of illusions in Kant's "Critique of Pure Reason". Usually we focus on the transcendental illusions, namely, Kant's doctrine of the paralogisms, antinomies and ideals. Although this point of view is reasonable and has self-contained clarity, we cannot obtain a thorough-going perspective on Kant's true problem, because there are other kinds of illusions scattered throughout the entire text of "Critique of Pure Reason" : "noumena" and "reflexive concept". In addition, the author asserts that in order to understand Kant's theory of illusions fully, we must take his most important doctrine into consideration, that is, his distinction of appearance and thing in itself. In transcendental Aeth...