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 (332, 334) 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 (332, 334) 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 (332, 334) 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.