The article is devoted to the study of the philosophical and legal dimensions of the logic of assessing evidence in the constitutional litigation and its impact on the adoption of a fair and justified judicial decision. Particular attention is paid to the definition of general principles and differences in the ideological and functional specifics of the logic of assessing evidence in the activities of the body of constitutional jurisdiction to protect the rights and fundamental freedoms of man and citizen. According to the results of the research, the author concludes that the tasks of modernity require a new understanding of logic in the field of constitutional procedural law, especially with regard to the evaluation of evidence as the basis for a correct, justified and fair judicial decision.