There is disclosed a rotating anode X-ray tube assembly includes a vacuum envelope integrated with an anode target, a housing receiving at least the vacuum envelope, and rotatably holding it, a circulation path circulating a cooling medium in a state of closing to at least anode target of the vacuum envelope, a cathode received and arranged in the vacuum envelope, a cathode support member supporting the cathode, a bearing mechanism and a vacuum sealing mechanism interposed between the vacuum envelope, and the housing or a stationary member direct or indirectly fixed to the housing, and a driver unit for rotating the vacuum envelope.