In this paper is examined the evolution of the idea of consciousness in Bergson’s works –Essai sur les donnés immédiates de la conscience (1889), Matière et mémoire (1896), L’évolution créatrice (1907)–, firstly exploring the significance of this idea in Bergson’s contemporary philosophic thought and then analysing the variations and enrichments, explicit and underlying, of it in his own thinking, coming to the conclusion that Bergson’s idea of consciousness changes from being mainly cognitive to coincide with the idea of human life.