The aim of the paper is a historical analysis and evaluate of the metaphysic of neo-Kantian philosopher Johannes Volkelt and of post-neo-Kantian Martin Heidegger. Heidegger’s approach to Kant’s critique of pure reason (transcendental philosophy) as the foundation of metaphysics is not new and it had a major precursor in the metaphysical neo-Kantianism. In the neo-Kantianism was taken inside the question of the possibility of metaphysics, not only as metaphysica specialis, but also as the ontology (metaphysica generalis).