This paper deals with the major concepts of Scanlon’s moral contractualism. It is possible to describe moral contractualism as the ability to identify priorities and moral reasons in deliberative action, that no one could reasonably reject. These capabilities require us to take into account the interests of others in our moral judgments. The result is that Scanlon overthrow the philosophy of Hobbes: morality is not originated from politics; on the contrary, politics is a function of morality. His answer to the dilemma of Prichard is particularly persuasive, though the proof of the falsity of the skeptical position can only be dialectic and persuasive is its intellectualistic position on relations between reasons and desires, too