EN
The paper presents the process of modern metaphysics transforming into the ontology. The major points of this process became: 1) scholastic sources of Catholic metaphysics represented by Fonseca, Suarez, Śmiglecki on the one side and Protestant metaphysics, represented by Goclenius and Clauberg, on the other; 2) Descartes’ epistemology of representation and 3) Leibniz’s rational and pluralistic metaphysics (monadology). The climax of the transformation process appears to be “Philosophia prima sive ontologia” (1729), a masterpiece being written by Wolff, where the first system of the ontology (science about being as possibility) was presented as a discipline independent from the traditional metaphysics. However starting with the Kant’s works ontology no longer was the discipline of knowledge about the real world but has being turned into a field of aprioristic categories of thinking about an existence and the physical world.