The task of this dissertation is to examine the role played by the time and space representations in Kant`s critical system. But, several questions emerge from this inquiry, and if we are to respect Kant`s legacy and his methodological spirit we shall not neglect them. Then, as an effort to shed light over such an obscure matter the present work accepts the challenge, and establishes it as a starting point, of expounding time and space concepts through a historical analysis. And on the solid grounds of the philosophical tradition we can rest and regain strength to continue following Kant`s steps and finding the origins of the Transcendental Aesthetics. Therefore, the core of this investigation is determining accurately the meaning of time and space representations and its implications to Kant`s theory of knowledge. Finally, at the end of this troubled journey we will have reached a better understanding of the relationship between the time and space intuitions and the thing-in-itself and its significance to the transcendental idealism.