The main purpose of the thesis is to contribute to the theory and clinic of mania inside the Freudian perspective of psychoanalysis. An incompatibility was found between clinical experience with patients in manic crisis and the Freudian's conception of mania as a state in which there is a fusion between the Ego and the Ego-Ideal, that implies its revocation. In this perspective, the manic Ego would be characterized by a state of disinhibition and exaltation of humor, in analogy with the party. However, the clinical cases presented here indicate a biographical break, a transformation of the Ego into another being, along with the emergence of a strong group feeling. The Ego becomes a powerful being, usually with a mission to lead the "We" according to some ethical and political principles. Mainly these two aspects do not converge with the idea of revoking the Ego-Ideal and the elimination of normative restrictions. Our thesis then proposes an inversion in the Freudian solution, replacing the concept of the triumph of the Ego by the concept of invasion and triumph of the Ideal, in which the Ego would be the silenced instance. Instead of the party, the model of group mind formation and contagion of affections is proposed. To accomplish this task, a historical reconstitution of the mania category was made, and then the main features of its symptomatology were traced. This will allow us to identify how mania was appropriated by the first generation of psychoanalysts and fundamentally by Freud. The thesis is based on a study of nine clinical cases of mania, most of them collected during experience in the context of psychiatric hospitalization.