Disclosed is an X-ray photographing apparatus comprising: an X-ray generator for generating X-rays; an X-ray detector for detecting the X-rays discharged from the X-ray generator; and a collimator for permitting only a portion of the X-rays to pass through and blocking the rest X-rays, wherein the apparatus further comprising a support means for supporting the X-rays generator and the X-ray detector and varying heights of the X-ray generator and the X-ray detector, wherein the X-ray generator and the X-ray detector are arranged facing each other at respective left and right sides with respect to the support means for supporting the X-ray generator and the X-ray detector so as to achieve a weight balance, and the support means has an X-ray path through which the X-rays generated by the X-ray generator pass without interference.