[Problem] To provide a medical X-ray diagnostic device whereby a subject (M) can be placed on and taken off of an imaging bed (1) safely, easily, and comfortably. [Solution] In this medical X-ray diagnostic device, a placement-accommodating-state memory (21) stores a plurality of placement-accommodating states each consisting of an imaging bed (1) position and orientation and an X-ray tube (4) position that accommodate a given placement state of the subject (M). The medical X-ray diagnostic device is provided with a placement-accommodating-state control unit (22) that, if a desired placement-accommodating state is specified from among the plurality of placement-accommodating states by means of a control panel (11), makes the position of the imaging bed (1) and the position of the X-ray tube (4) conform to the specified placement-accommodating state. An appropriate placement-accommodating state is thus set automatically, making it such that the subject (M) can be placed on and taken off of the imaging bed (1) very easily and comfortably without a collimator (4a) attached to the X-ray tube (4) getting in the way. Furthermore, the X-ray tube (4) can be moved quickly and safely relative to movement of other parts, allowing X-ray fluoroscopy to progress smoothly.La présente invention concerne un dispositif de diagnostic médical à rayons X grâce auquel un patient (M) peut être placé sur une table dexamen (1) et peut en être retiré en toute sécurité, simplement et confortablement. Le dispositif de diagnostic médical à rayons X de la présente invention possède une mémoire détat de mise en place (21) qui stocke une pluralité détats de mise en place comprenant chacun une position et orientation de la table dexamen (1) et une position du tube radiogène (4) qui fournissent un état de mise en place donné du patient (M). Le dispositif de diagnostic médical à rayons X est doté dune unité de commande détat de mise en place (22) qui, si un état de mise en place souhaité est spécifié
