Mindful of the need to give effect to the Law and being the jurisdiction one of the instruments able to recognize the fundamental rights, this study aims to map out a study on the provision of judicial protection, especially as regards the definition and concretion of legal certainty while fundamental right. Seeks, with this assay, through the use of hypothetical-deductive method, making use of bibliographic research, analyze what the main purpose of legal certainty as a structuring fundamental right of the Constitutional State in achieving the effectiveness of the jurisdiction and Law itself.