In the business world, the liability of the employer or its representatives is related to their powers. Is it the same concerning the staff representatives ? Answering this question need to determine the nature of the powers available to the mandate holders. Thus, the aim of thisstudy is to propose a classification of the functions of staff representatives, as presented in theLabour regulations. Analyzing their nature leads to put them essentially in the category offunction-rights and often not in the category of the powers. The consequence is not, as expected, the rejection of any responsibility. The label of function-rights leads to an original system of liability, which is able to punish the default of duty to act. The lack of power ofstaff representatives does not mean immunity.