The paper examines the problem of the relation between subject and truth in Michel Foucault, with special reference to his 1981-2 course at the Collège de France. Here Foucault argues that the connection between truth and knowledge is relatively recent in the history of the relation between subject and truth and Descartes’ s cogito plays an emblematic role in it. The author then argues against Foucault the importance of the Cartesian stance about truth.