The aim of this study is to explain how is Man defined in Rousseaus philosophy. In order to do that it is necessary to address the lack of consensus between commentators and and Rousseaus actual development of that issue not in a systematic way. Here, the strategy to avoid those pitfalls is an analysis of the evolution of his anthropological thought as well as chasing common traits in studies on Rousseaus work. The obtained results lead to a first conclusion according to which Rousseau does not think about Man from a universal point of view but rather thinks about Man as a collection of independent beings, each being able to build particular subjects: Man can only be defined through a model able to shelter all possible cases. This, precisely, allows to conclude that Rousseau defines man as a dual being, delimited by a entity capable of holding a unique identity which is the moral space from where the social space springs out.