The invention provides a blade (10) comprising a central rigidifying element (20), a wiping strip (14) and an element (16) forming an aerodynamic deflector that has a contour (AE-FM-MA) with an overall triangular shape comprising a front side (AE) that delimits the side of the aerodynamic deflector (16) that faces the wind, characterized in that the ratio (H/L) of the total height (H) of the windscreen wiper blade (10) to the overall transversal width (L) of the windscreen wiper blade (10), is comprised between 1.5 and 2.