A sealing device (1) for a wheel hub rolling bearing assembly (3) having an outer ring and an inner ring, comprising: a first annular shield (16), stationary in use, and a second annular shield (21), rotating in use, each having a journalling portion (17,22) and a flange portion (18,23) which radially extends in cantilever fashion from the journalling portion (17, 22) and towards the other shield; and an annular sealing element (24) carried by the first shield (16) and provided with a plurality of annular sealing lips (25,26,27). The first shield (16) is coupled radially on the outside of the outer ring (8). The flange portion (23) of the second shield is provided with an encoder (19) and comprises a radially outer annular stretch (29) opposite to the journalling portion (22), which axially extends towards the first shield (16) and which is incurved radially from the exterior towards the interior, on the side opposite to the first shield, to form in radial section a U arranged parallel to a common symmetry axis (A) of the first and second shield and having a concavity (30) thereof facing the side opposite to the first shield (16).
