This article offers first of all an analysis of the representation of the person suffering from mental disability or mental disorders which is found in the call for deinstitutionalisation aired by the Committee on the Rights of Persons with Disabilities (United Nations). It then shows how this anthropology, which is at the same time demanding and perfectly in sync with the ideals of a society in which personal autonomy is the right and the duty of each individual, is practically negotiated on the field of a mental health residential facility which provides support for its patients when they leave the institution at the end of their stay. The paper takes as empirical object a central feature of this process, the “partner-meetings” and the conversations taking place between the patient and other actors. The paper shows that, far from the abstraction of juridical texts, the care providers’ perception of the patient as a partner is a fragile process. The partnership is always conditioned, for the care providers, by an absence of worries about the persons’ (in)abilities to look after themselves, and by a demonstration of the latter’s desire for and capacities for autonomy. In these negotiations, the patient in mental healthcare is always potentially, but never completely, the partner in the process of leaving the institution.