Streamlined flat windscreen wiper (1), in particular of a vehicle, characterized in that it comprises: a longitudinal wiper blade (8), at least one longitudinal stiffening spine (6), a longitudinal member (7) for holding said wiper blade and said stiffening spine, a longitudinal fairing (2, 3) comprising two end caps (3) and a central mount (2) extending between the end caps and being linked thereto, the mount comprising means for fixing to said stiffening spine or to said member for holding this spine.