This article is the result of research developed from the analysis of the jurisprudence of the Inter-American Court of Human Rights and the doctrine specialized on conventionality control with a marked critical accent. The main conclusion of this work is that there is no definitive concept of internal conventionality control, but is rather a hybrid concept, currently unfinished and controversial, which has been built up gradually by the Inter-American Court of Human Rights through their judgments. This creates uncertainty about the very concept of conventionality, its nature, recipients, parameter and object of control, and the effects of the declaration of unconventionality.