To provide an X-ray perspective photographing device which uses a flat panel detector or a detector for outputting an electric signal such as an image intensifier combined with a television camera as an X-ray receiving photographer to reduce the effect of noise generated by an X-ray tube device on an X-ray image.

The device comprises an insulating plate 4 such as a fluorocarbon resin 4 having a thickness of 1 mm and an insulating ring 5 made of a phenolic resin, wherein the insulating plate is fixed by a screw on the inner peripheral surface of two circles constructed by the fixing rings 2A and 2B of an X-ray tube fixing device 2; and the insulating ring 5 is positioned to touch with the outer side surface of two supporting rings 3B in the X-ray tube device 1 and to support the X-ray tube device 1 with the fixing ring 2B, allowing insulation between the X-ray tube device 1 and the X-ray tube fixing device 2 to reduce the effect of noise generated by the X-ray tube device on the X-ray image.