International audienceThis article, through the examination of two of the orientations of the analysis of the for-itself in Being and nothingness, aims to identify the different levels of constitution and meaning of the notion of facticity: the first concerns the emergence of the for-itself within the for-itself, the second the internal differentiations of the structure of the for-itself.Beyond these aspects, this notion is a manifestation of a dimension of the world (re-emerged through freedom as a situation) and not only a matter of for-itself. We can therefore better understand its relationship with another fundamental notion, contingency, and identify the dimensions and configurations of facticity according to the different existential ...