To constitute an X-ray radiographing device so that a stroke between supporting members bringing a film and an intensifying screen into closely contact with each other at a photographing part can be made large without enlarging the external size of both members.

By fixing a front-side supporting plate 41 to an X-ray radiographing device main body, fitting the intensifying screen 46 on a back side to the high-rigidity carbon plate 49 of a back-side supporting plate 42 and enabling the plate 42 to be moved at the photographing part 40, the external size of the plates 41 and 42 need not be enlarged even when the stroke between both plates 41 and 42 must be secured large to a certain extent. Therefore, only the amount of the stroke can be increased without changing the external size and the device is prevented from being large in size.