An X-ray imaging device, comprising: an X-ray source for irradiating a subject with X-ray flux; an X-ray imaging unit for detecting the X-ray flux passing through the subject; a support member for supporting the X-ray source and the X-ray imaging unit; a turn-driving unit for turning the X-ray source and the X-ray imaging unit around the subject by rotating the support member; a shifting unit for shifting a transmission part (R1, R2, R3, R4, R5) of the subject, through which the X-ray flux detected by the X-ray imaging unit passes; and a control section for controlling operation of the turn-driving unit and the shifting unit, wherein the control section is configured so that it executes detection of the X-ray flux passing through the subject by the X-ray imaging unit, while simultaneously executing turning of the X-ray source and the X-ray imaging unit around the subject by rotating the support member by operating the turn-driving unit, and shifting the transmission part of the subject, through which the X-ray flux detected by the X-ray imaging unit passes, by operating the shifting unit, characterized by the shifting unit being a turning-center-position circumferential-direction-moving mechanism for moving a turning-center position of the support member along a circumferential direction of a circle having a center at a point on a line connecting the X-ray source with the X-ray imaging unit, wherein the shifting unit is provided with a slide gear in an arcuate shape to which a connecting shaft is fixed, a pinion gear engaged with the slide gear, a pinion gear rotational-driving unit, such as a servo motor, for rotationally driving the pinion gear, and a guide member for guiding the circumferentially directed movement of the slide gear, wherein the connecting shaft is fixed to the upper surface of a turning arm turnable by the turn-driving unit and having an arcuate movement central axis, wherein a turning shaft is fixed to the upper portion of the shifting unit, wherein inner teeth are formed inside the slide gear, with the arcuate movement central axis as the center so that in the shifting unit, the pinion gear is rotated by the operation of the pinion gear rotational-driving unit, and the gear force moves the slide gear so that the connecting shaft can be shifted along the circumferential direction of a circle with a radius (r) with the arcuate movement central axis as the center; a guide groove for guiding the movement of the connecting shaft. an X-ray source for irradiating a subject with X-ray flux; an X-ray imaging unit for detecting the X-ray flux passing through the subject; a support member for supporting the X-ray source and the X-ray imaging unit; a turn-driving unit for turning the X-ray source and the X-ray imaging unit around the subject by rotating the support member; a shifting unit for shifting a transmission part (R1, R2, R3, R4, R5) of the subject, through which the X-ray flux detected by the X-ray imaging unit passes; and a control section for controlling operation of the turn-driving unit and the shifting unit, wherein the control section is configured so that it executes detection of the X-ray flux passing through the subject by the X-ray imaging unit, while simultaneously executing turning of the X-ray source and the X-ray imaging unit around the subject by rotating the support member by operating the turn-driving unit, and shifting the transmission part of the subject, through which the X-ray flux detected by the X-ray imaging unit passes, by operating the shifting unit, characterized by the shifting unit being a turning-center-position circumferential-direction-moving mechanism for moving a turning-center position of the support member along a circumferential direction of a circle having a center at a point on a line connecting the X-ray source with the X-ray imaging unit, wherein the shifting unit is provided with a slide gear in an arcuate shape to which a connecting shaft is fixed, a pinion gear engaged with the slide gear, a pinion gear rotational-driving unit, such as a servo motor, for rotationally driving the pinion gear, and a guide member for guiding the circumferentially directed movement of the slide gear, wherein the connecting shaft is fixed to the upper surface of a turning arm turnable by the turn-driving unit and having an arcuate movement central axis, wherein a turning shaft is fixed to the upper portion of the shifting unit, wherein inner teeth are formed inside the slide gear, with the arcuate movement central axis as the center so that in the shifting unit, the pinion gear is rotated by the operation of the pinion gear rotational-driving unit, and the gear force moves the slide gear so that the connecting shaft can be shifted along the circumferential direction of a circle with a radius (r) with the arcuate movement central axis as the center; a guide groove for guiding the movement of the connecting shaft.