A vehicle hub bearing unit (1) including an outer ring (2); a wheel hub (3) rotating about a common axis of symmetry (A) of the outer ring and of the wheel hub; a wheel flange (5) that extends radially from the wheel hub on the outside of the outer ring (2); a plurality of rolling bodies (6) interposed between the outer ring and the wheel hub; at least one sealing assembly (8) arranged on the side of the wheel flange (5), which is delimited towards the outer ring by a radially extending first face (11); and a protective ring (13) that surrounds the outer ring (2) and which radially extends in a position facing the first face (11) of the wheel flange and beyond a first annular step (21) of the first face that protrudes axially; a radially outer section (23) of the protective ring (13) overhangingly axially extending from the outer ring (2) towards the wheel flange (5) and axially beyond the first annular step (21).
