Abstract: An X-ray diagnosis apparatus includes a radiography image generating unit, a fluoroscopy image generating unit, a display control unit and an irradiation field changing unit. The radiography image generating unit controls an X-ray irradiation device, an X-ray detection device, a retainer, and a bed system, and generates a radiography image by using a radiography irradiation field. The fluoroscopy image generating unit controls the X-ray irradiation device, the X-ray detection device, the retainer, and the bed system, and generates a fluoroscopy image by using a fluoroscopy irradiation field, the fluoroscopy irradiation field being narrower than the radiography irradiation field. The display control unit generates a superimposed image in which the fluoroscopy image is superimposed on a part of the radiography image, and displays the superimposed image on a display device. The irradiation field changing unit changes the fluoroscopy irradiation field with the superimposed image being displayed.