The present invention is related to a fixing assembly for use in, e.g., a switch device, said assembly comprising a female element (10) in the first piece (21) to be connected and a male element (12) in the second piece (18) to be connected. According to the invention, the male element (12) is elongated and elastic and has its end (14) provided with at least one locking surface (15), and the female element (10) comprises at least one locking shoulder (11) and a corresponding widening recess (19) of the female element passageway for the purpose of permitting the entry of a locking surface (15) of the end (14) of the male element (12) to the rear of the locking shoulder (11) into a locking position by way of a twisting/untwisting motion.