PURPOSE: To make it possible to output a signal current of a camera tube immediately when fluoroscopy photographing is started by making an optical emitter provided in an optical passage leading from the output surface of I.I. to a photographing surface to emit light in the form of a pulse at a prescribed timing when a target voltage of the camera tube is switched from a high voltage to a low voltage.

CONSTITUTION: The X-ray television photographing device in the caption comprise a X-ray tube 1, a X-ray high voltage generator 2, an image intensifier (I.I.)3, a television camera 4, an optical system 5 and a system controller 6. An optical emitter 13 is provided in an optical passage from the output surface of I.I.3 to the photographing surface 9 of the camera tube 8 of the television camera 4. When a target voltage of the camera tube 8 is switched from a high voltage to a low voltage by control of the system controller 6, light in the form of a pulse is emitted until new outdoor daylight is incident on the above camera tube 8 after the voltage is switched. Therefore, even if a week light of fluoroscopy photographing is incident, it is possible to output a signal current of the camera tube 8 immediately when photographing is started.