A wheel hub unit for vehicle wheels, the unit having an axis of rotation and comprising: - a flanged inner ring with a flange for supporting a wheel, - an outer ring comprising a cylindrical edge which faces the flange and provides a cylindrical surface which is coaxial with the axis, - rolling bodies arranged between the inner ring and the outer ring, - a sealing device positioned on the wheel side and comprising, in turn, one or more sealing lips and a flinger which is mounted on a keying surface of the inner ring and is positioned in contact with the sealing lips, the flinger comprising a respective cylindrical portion which is keyed onto the keying surface and a flanged portion which is fixed to and transverse with respect to the cylindrical portion; - a first axial abutting shoulder which is formed along the keying surface on which the flinger is keyed and which is positioned in contact with the flinger, wherein the sealing device is positioned inside a seat which is delimited - radially outwardly, by the cylindrical surface of the cylindrical edge, - radially inwardly, by the keying surface, - axially outwardly, by an annular surface which is transverse to the axis and is formed by the shoulder, the seat being open towards the rolling contact bodies, wherein the cylindrical surface of the cylindrical edge extends axially beyond the keying surface towards the flange; characterized in that the flanged portion of the flinger is positioned in contact with the annular surface of the first abutting shoulder, that the flanged portion has a radial length of not more than one and a half times the radial height of the first abutting shoulder, and that the first abutting shoulder is axially delimited: on the side where the keying surface is located, by the annular surface and on the side where the flange is located, by an annular surface having a curved cross section, the annular surface and the curved annular surface forming an angled edge between them. - a flanged inner ring with a flange for supporting a wheel, - an outer ring comprising a cylindrical edge which faces the flange and provides a cylindrical surface which is coaxial with the axis, - rolling bodies arranged between the inner ring and the outer ring, - a sealing device positioned on the wheel side and comprising, in turn, one or more sealing lips and a flinger which is mounted on a keying surface of the inner ring and is positioned in contact with the sealing lips, the flinger comprising a respective cylindrical portion which is keyed onto the keying surface and a flanged portion which is fixed to and transverse with respect to the cylindrical portion; - a first axial abutting shoulder which is formed along the keying surface on which the flinger is keyed and which is positioned in contact with the flinger, wherein the sealing device is positioned inside a seat which is delimited - radially outwardly, by the cylindrical surface of the cylindrical edge, - radially inwardly, by the keying surface, - axially outwardly, by an annular surface which is transverse to the axis and is formed by the shoulder, the seat being open towards the rolling contact bodies, on the side where the keying surface is located, by the annular surface and on the side where the flange is located, by an annular surface having a curved cross section, the annular surface and the curved annular surface forming an angled edge between them.