Abstract
This paper is a part of work to formulate the Foucault's empirical method which enable us to think of social phenomena and our experiences in other way. We would like to make clear the methodological meaning of Foucault's change betweenLa volonté de savoir (1976) andL'usage des plaisirs, Le souci de sal (1984) in this paper. We would examine this change from three aspects, that is, alteration of power model, diminution of analytical level from two to one, and installation of 'ethics'. Then we would clarify the fundamental perspective of Foucault' s historical ontology in his last years.
