The article proposes elements for a social history of constitutionalism and its relation to the political battles in Argentina. The investment of the different fractions of the political elite in the constitutional interpretation is considered as one of the legitimation strategies of successive political regimes aiming at its formalisation in the juridical technique. The first part deals with the socio-historical contours of Argentine constitutionalism with emphasis on its legitimacy in the academic field. The second part focuses on the intensification of the political uses of Constitutional Law and the modalities of intersection of its agents in the political space.