PROBLEM TO BE SOLVED: To display an image in a display mode corresponding to a direction of an object to be examined seen from an observer.SOLUTION: A medical diagnostic apparatus includes: an X-ray tube for applying an X-ray an X-ray detector for detecting an X-ray that is applied by the X-ray tube and transmits an object to be examined, and generating a detection signal on the basis of the detected X-ray an image data generation part for generating image data on the basis of the detection signal generated by the X-ray detector a display part for displaying an image based on the image data generated by the image data generation part a display mode control part for controlling a display mode of the image displayed in the display part on the basis of the information corresponding to the position of an observer who observes the image displayed in the display part.
