An X-ray diagnostic apparatus of an embodiment includes: an adjuster for adjusting an X-ray irradiation field of a radiographing unit a range setter for setting an imaging range to be imaged by the radiographing unit an interval setter for setting an imaging interval to be used when the radiographing unit images the imaging range an area setter for setting a size of an image stitching area in which to stitch the X-ray images an irradiation field acquirer for finding a target X-ray irradiation field of the radiographing unit by use of the imaging interval and the size of the image stitching area and a controller for controlling the adjuster on the basis of the target X-ray irradiation field.
