Drawing on Ludwig Binswanger’s work, this paper seeks to reconstruct historically and theoretically his relationship with Freud and Psychoanalysis and to trace his ideas with regard to the Unconscious. Tied to Freud by a friendship lasting thirty years, it started mainly from his encounter with the philosophy of Immanuel Kant, Alexander Pfänder, Franz Brentano, Edmund Husserl, Martin Heidegger and Martin Buber that Binswanger developed an original system of thinking and clinical application. The issue of the unconscious, beginning from this theoretical (...) shift, underwent a radical reformulation. First, Heideggerian thought allowed him to recognize the importance of different World-Projects, intended as existential a priori characterized by a specific internal normativity. Subsequently, the return to Husserl’s thinking lead Binswanger to rethink again the unconscious issue in light of the field of Passive Synthesis. In this paper we will examine all these issues and reconsider their importance for psychotherapeutic practice. (shrink)