This work, following the route of the central work of Sartre and show that the for-itself, or consciousness, always intentional, or positional results that it reflects the world without getting anything in the world, ie, consciousness is empty of content, so it is nothing. It is upon questioning that awareness drives about herself that she is revealed as nothing or "full" of anything, we are situated by nihilism, however, it is not an external nihilism as Nietzsche put, but an internal nihilism as a result of our being nothing. How to "build" our parti be nothing? How to give meaning to the world out of nothing? It is in this atmosphere of loneliness and anguish that bad faith is presented as a refuge and relief valve to nausea that plagues us. In this context, I intend to discuss the reflections of Sartre who go to the consciousness as nothing to bad faith.