Deals with a syntactic structure called in grammar left and right dislocation : Paul, he is a nice guy ; He is a nice guy, Paul. The analysis is based on a body of articles in the journalistic press. Following an initial description of this syntactic structure and of the framework of analysis, this article provides a close study of dialogic function of dislocation. The hypothesis of work stipulates that the dislocation is dialogic because the theme implies a relationship with a prior utterance by another enunciation. This relationship between two utterances makes dislocation a dialogic marker and produces in a discourse, according to the rheme and the context, the different effects of sense : agreement, concession, irony, etc.