A sun visor for automobiles that makes operation smooth and minimizes a reaction force, the sun visor includes a sun visor body including a supporter receiver (Rs) having both side walls, a top surface and a bottom surface; a shaft horizontally disposed in the supporter receiver through one side wall; and a supporter received in the supporter receiver (Rs) of the sun visor body, and rotatably supported by shaft support holes, to which the shaft is inserted, while horizontal movement of the supporter is limited, in which upper and lower portions of front and rear surfaces of the supporter are provided with upper support curved surfaces and lower support curved surfaces in a longitudinal direction which are opposite to each other.