Windscreen-wiper blade for a windscreen-wiper system of a vehicle and method for assembling same

Wiper blade (110) for a wiping system of a vehicle window, in particular an automotive window, comprising a longitudinal body (114) and a wiping blade (116) formed in one piece, said piece comprising a cavity (130) for receiving an elongated elastic strip-shaped support element (118), the elongated elastic strip-shaped support element being housed in a recess (160) of a longitudinal member (132) for holding the wiping blade, this holding member being housed in said cavity (130).