Abstract: A main body of a diagnostic table apparatus holds a supporting body slidably. The supporting body holds an X-ray tube and an X-ray flat panel detector so as to face each other. A tabletop of the diagnostic table is fitted rotatably to the main body of the diagnostic table apparatus via a hinge as a diagnostic table withdrawing mechanism. In case a chest radiography is to be taken in a standing position, the tabletop of the diagnostic table is withdrawn, an X-ray is irradiated from the back of the subject who faces an X-ray flat panel detector and puts his or her chin on a chin holder.