The philosophical point of view of Rawls is here analysed; and how Rawls’s philosophical position implies an epistemological cut with the classical conceptions that were joining the social contract to a determined natural idea of man or of society. In his proposal, the idea of Justice, in a society, is established in the fact that men accomplish a social pact fireely in itself, with another reasonable men, using various goods, and possessing equal politic rights. Rawls prefers not to choose the disjunctive “freedom or equality”; but for the option enunciated like “freedom and justice”. Equality is not a value as such in itself, yet contingent upon the idea of Justice. Nevertheless this justice from his social point of view is a politic justice. This is constituted freely for the associates, with equal rights, in a pact. His conception is not revolutionary in order to solve injustices right now historically established, but a progressive conception that utilizes the freedom to advance toward a fair equality, and here is now examined.