The disclosure relates to a rotating-anode bearing for an X-ray tube comprising a rotor shaft extending along a longitudinal axis from a first axial end to a second axial end and supported to be rotatable about the longitudinal axis; wherein the rotor shaft has an anode holder in the area of the first axial end; and the anode holder comprises a flange which has a larger diameter than at least an adjacent section of the rotor shaft. The rotating-anode bearing according to the disclosure wherein the rotor shaft together with the flange is made as an integrally forged part.