Study of the theoretical foundations and philosophical concepts of axiology, value concept, ontological and epistemological nature of values, subject and object as values, intrinsic and instrumental values, axiological normativity, and evaluation criteria. Discusses the relativity and objectivity of values, axiological hierarchies, metaphysical and semantic analysis of values, methods of evaluating values, and their connection with ethics, aesthetics, and political philosophy. Historical sources: Plato, Aristotle, Kant, XIX-XX century thinkers