Abstract
Nietzsche uses many of the arguments used by himself against metaphysics in general to criticize the Cartesian cogito. The affinity indicated by Descartes himself between cogito and conscience means that the study focuses on the Nietzschean analysis of the problem of conscience, paying special attention to its anthropological implications. Faced with Cartesian reasoncentrism, Nietzsche maintains that, given that conscience is not an entity removed from the natural world, it is possible to present a strictly naturalist anthropology, eliminating the need to resort to dualist hypothesis drawn from metaphysics or theology