In this paper, the author attempts to show how Winnicott rejected the basic concepts of Freud's metapsychology, namely the concepts of Trieb (instinct/drive), psychical apparatus and libido. To that purpose, he first elucidates what metapsychology is, according to Freud. Freud describes metapsychology as a speculative superstructure of psychoanalysis in which the aforementioned concepts correspond to the dynamic, topographical and economic viewpoints. The author then presents an explanation of what metapsychology means in Winnicott's view, and examines his criticism of this kind of speculative theorization in psychoanalysis, as well as his suggested substitute for each of those basic concepts. Subsequent analysis shows that Winnicott replaced the main concepts of the metapsychological theory, which have no correlation whatsoever in the phenomenal world, with a set of other, non-speculative concepts, thereby favouring a factual theorization.