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

The invention relates to a wiper blade for a window wiping system of a vehicle, in particular an automobile, comprising: - a wiping blade (16), - an elongated elastic support element in the form of a band (18), - a longitudinal holding member (30) for holding the blade (16) which comprises a first longitudinal housing (32) for receiving a heel (34) of the blade (16) and a second longitudinal housing (42) for receiving said support element (18), and - a longitudinal body (14) which forms an aerodynamic deflector (20) and which comprises attachment means on the holding member (30), wherein the longitudinal body (14) is fixed in a non-detachable manner to the holding member (30).