The present invention relates to an X-ray imaging device capable of obtaining tomograms and three-dimensional images of an FOV limited to a target area inside a subject being imaged, by using multidirectional X-rays to the subject being imaged, the imaging device according to the present invention comprising: an x-ray radiation unit for radiating X-rays to the predetermined target areas of a subject being imaged in respective imaging positions； an X-ray sensing unit for receiving the X-rays, which have passed through the target areas, in the respective imaging positions, and forming X-ray projection data on the target areas； a movement unit for arranging the X-ray radiation unit and the X-ray sensing unit to face each other in the respective imaging positions, with the subject being imaged therebetween, by rotating the X-ray radiation unit and/or the X-ray sensing unit about a variable axis of rotation during a single imaging occasion where image information is obtained as all the areas in the subject being imaged are irradiated with the X-rays； a position information provision unit for providing position information on the X-ray radiation unit and the X-ray sensing unit, position information on the variable axis of rotation, and position information on the target areas in the respective imaging positions pre-configured such that at least a part of a first target area in the previous imaging position is irradiated in an overlapping manner with X-rays radiated to a second target area in the next imaging position during the single imaging occasion； a control unit for controlling the X-ray radiation unit, the X-ray sensing unit, and the movement unit on the basis of the position information on the target areas in the respective imaging positions and the position information on the X-ray radiation unit and the X-ray sensing unit； and an image processing unit for forming three-dimensional images of the subject being imaged from the projection data obtained during the sin
