The impossible moral in Heidegger is based on two fundamental facts: firstly, that Heidegger devoted himself to the theme of being. All other issues, thesis or questions derive from that fundamental and unique “question about the meaning of Being”. Secondly, the ontological question in Heidegger wasn’t the question for the entity, but the question for the Being. On these bases, “The impossible moral” in Heidegger arises from his initial ontological argumentation from which all other structures derive and that Heidegger tries to separate from each anthropological, psychological or biological matter. In fact, we may suggest that an ethical approach in Heidegger could only arise from the exegesis of the structural whole of the “being-in-the-world”. This would happen by apprehending the original being of the “being-there” as “care” that isn’t anything else that the manifestation of the following features: “being-with” and “being one’s self”. All these without forgetting that Being and time has an ontological fundamental intention. Finally, “The impossible moral” in Heidegger is given by his radical antihumanism.