An X-ray photographing device (1, 1'), comprising: an X-ray source for emitting an X-ray flux to a subject; an X-ray photographing means for detecting the X-ray flux passing through the subject; a supporting member for supporting the X-ray source and the X-ray photographing means; a turning means for turning the supporting member to turn the X-ray source and the X-ray photographing means around the subject; an arcuate movement means (4, 5, 61, 62) for arcuately moving the X-ray photographing means around the subject by turning the X-ray photographing means around an arcuate movement center axis provided on a line joining the subject and the X-ray photographing means; and a control unit for controlling operations of the turning means and the arcuate movement means (4, 5, 61, 62), wherein the arcuate movement center axis is provided at a position where the X-ray source is provided, and wherein the control unit continuously executes a first photographing step of detecting the X-ray flux passing through the subject by the X-ray photographing means while the X-ray photographing means is turned around the arcuate movement center axis within a first arcuate movement range by the arcuate movement means (4, 5, 61, 62); a shifting/turning step of shifting/turning the supporting member around the subject by the turning means; and a shifting/photographing step of detecting the X-ray flux passing through the subject by the X-ray photographing means while the X-ray photographing means is turned around the arcuate movement center axis within a second arcuate movement range by the arcuate movement means (4, 5, 61, 62) with the supporting member being shifted from the first arcuate movement range by an infinitesimal angle in the shifting/turning step, wherein the shifting/turning step and the shifting/photographing step are further executed sequentially following the shifting/photographing step. an X-ray source for emitting an X-ray flux to a subject; an X-ray photographing means for detecting the X-ray flux passing through the subject; a supporting member for supporting the X-ray source and the X-ray photographing means; a turning means for turning the supporting member to turn the X-ray source and the X-ray photographing means around the subject; an arcuate movement means (4, 5, 61, 62) for arcuately moving the X-ray photographing means around the subject by turning the X-ray photographing means around an arcuate movement center axis provided on a line joining the subject and the X-ray photographing means; and a control unit for controlling operations of the turning means and the arcuate movement means (4, 5, 61, 62), wherein the arcuate movement center axis is provided at a position where the X-ray source is provided, and wherein the control unit continuously executes a first photographing step of detecting the X-ray flux passing through the subject by the X-ray photographing means while the X-ray photographing means is turned around the arcuate movement center axis within a first arcuate movement range by the arcuate movement means (4, 5, 61, 62); a shifting/turning step of shifting/turning the supporting member around the subject by the turning means; and a shifting/photographing step of detecting the X-ray flux passing through the subject by the X-ray photographing means while the X-ray photographing means is turned around the arcuate movement center axis within a second arcuate movement range by the arcuate movement means (4, 5, 61, 62) with the supporting member being shifted from the first arcuate movement range by an infinitesimal angle in the shifting/turning step, a first photographing step of detecting the X-ray flux passing through the subject by the X-ray photographing means while the X-ray photographing means is turned around the arcuate movement center axis within a first arcuate movement range by the arcuate movement means (4, 5, 61, 62); a shifting/turning step of shifting/turning the supporting member around the subject by the turning means; and a shifting/photographing step of detecting the X-ray flux passing through the subject by the X-ray photographing means while the X-ray photographing means is turned around the arcuate movement center axis within a second arcuate movement range by the arcuate movement means (4, 5, 61, 62) with the supporting member being shifted from the first arcuate movement range by an infinitesimal angle in the shifting/turning step, wherein the shifting/turning step and the shifting/photographing step are further executed sequentially following the shifting/photographing step.