An X-ray apparatus includes a rotary-anode X-ray tube, a stator coil 17, and a drive-power-supply device 18. The rotary-anode X-ray tube has an anode target 12 arranged in a vacuum envelope 11, a rotary body 14 coupled to the anode target 12 and configured to rotate together with the anode target 12, and a fixed shaft 15 supporting the rotary body 14, allowing the same to rotate. The stator coil 17 generates a rotating magnetic field for rotating the rotary body 14 of the rotary-anode X-ray tube. The drive-power-supply device 18 controls drive power to be supplied to the stator coil 17. The apparatus is characterized by comprising: a memory unit 212 that stores a plurality of drive conditions for controlling the drive power to be supplied to the stator coil 17; and a control unit 213 that selects one drive condition from the plurality of drive conditions and causes the drive-power-supply device 18 to output drive power that matches said one drive condition. <IMAGE>