Sealing device for a rolling contact bearing (2) provide with a first shield (5) and second shield (7) which a re made of metal material and which are respectively coupled to an outer race (4) and an inner race (3) of the rolling contact bearing (2) itself, and a seal (10) which is made of synthetic material and which is integral to the first shield (5) and which presents a sealing lip (11) which is arranged substantially in contact with the second shield (7); the first shield (5) is defined by a cylindrical portion (15) which is assembled on the outer race (4), and the seal (10) is anchored to the cylindrical portion (15) in order to freely extend from and overhand the cylindrical portion (15) itself and presents, in axial section, a tapering shape towards a cylindrical sliding surface (13) of the second shield (7).