In this article we will analyze Foucault texts about Nietzsche: "Nietzsche, Freud and Marx" along with "Nietzsche, the genealogy and the history" as well as the philosopher texts about the History of sexuality, volume I, in order to show that in the first case, the French thinker seeks to attain the conceptual precision of the nietzschean reports starting from a intratextual reading, and in the second case, proceeds with the treatment of Nietzsche as an instrument of thought, making so that Foucault appropriates of Nietzsche to think his own philosophical questions.
Nietzsche; methodology; genealogy; history; sexuality