PROBLEM TO BE SOLVED: To collect images of a second detector excellent in resolution irrespective of a size of designated area of interest in an X-ray diagnostic apparatus.SOLUTION: The X-ray diagnostic apparatus 1 includes: an X-ray source a first detector: the second detector of which a maximum visual field size is smaller than a maximum visual field size of the first detector, capable of detecting X ray within the visual field of the first detector and switching control means 138 for controlling SID of the second detector depending on the visual field size of the second detector corresponding to a designated area of interest when an area of interest of the first detector is designated on an image.SELECTED DRAWING: Figure 6
