An X-ray imaging apparatus configured to radiograph first and second X-ray images having examination object's alignment positions different from each other, the X-ray imaging apparatus comprising: an imaging part configured to comprise a generator and a detector facing each other with the examination object interposed therebetween, and rotate the generator and the detector about a rotation axis therebetween to radiograph each of the first and second X-ray images; a main body configured to support the imaging part; and an examination object alignment part configured to support the examination object between the generator and the detector, wherein a position of at least a part of the examination object alignment part is variable, characterized in that the examination object alignment part further comprises: a frame connected to the main body ; and an examination object support configured to support the examination object and move along the frame , and in that the X-ray apparatus further comprises: a guide rail installed on the frame ; and first and second stopper holders installed to be spaced apart from each other along the guide rail to restrict respective movements of the examination object support , wherein the examination object support moves in reciprocation between a first reference position provided by the first stopper holder and a second reference position provided by the second stopper holder along the guiderail , wherein the first reference position is a first alignment position for radiographing the first X-ray image and the second reference position is a second alignment position for radiographing the second X-ray image, respectively. an imaging part configured to comprise a generator and a detector facing each other with the examination object interposed therebetween, and rotate the generator and the detector about a rotation axis therebetween to radiograph each of the first and second X-ray images; a main body configured to support the imaging part; and an examination object alignment part configured to support the examination object between the generator and the detector, wherein a position of at least a part of the examination object alignment part is variable, characterized in that the examination object alignment part further comprises: a frame connected to the main body ; and an examination object support configured to support the examination object and move along the frame , a frame connected to the main body ; and an examination object support configured to support the examination object and move along the frame , and in that the X-ray apparatus further comprises: a guide rail installed on the frame ; and first and second stopper holders installed to be spaced apart from each other along the guide rail to restrict respective movements of the examination object support , a guide rail installed on the frame ; and first and second stopper holders installed to be spaced apart from each other along the guide rail to restrict respective movements of the examination object support , wherein the examination object support moves in reciprocation between a first reference position provided by the first stopper holder and a second reference position provided by the second stopper holder along the guiderail , wherein the first reference position is a first alignment position for radiographing the first X-ray image and the second reference position is a second alignment position for radiographing the second X-ray image, respectively. <EOS>