External sun visor for vehicles, particularly for industrial vehicles

An external sun visor (1) for vehicles, particularly for industrial vehicles, has a panel (2) which can be placed in a position facing the upper portion (8) of the windscreen (9) of a vehicle (7) and is elongate along one of its axes (10; 10a) which is horizontal and orthogonal to the direction of advance (11) of the said vehicle (7); the panel (2) consists of an intermediate plate element (12) which remains unchanged for a plurality of vehicles different from each other, and two lateral plate elements (13) which are placed on opposite sides of the intermediate plate element (12) and which can be selected from a plurality of different plate elements (13; 13a) according to the vehicle to which the visor (1) is to be fitted.