An X-ray imaging apparatus (100) is proposed which includes an X-ray generation part (10), an X-ray detection part (20), and a revolution drive mechanism. The X-ray generation part (10) has an X-ray generator (13) including a cathode (91) and an anode (92), and emits an X-ray beam from the X-ray generator (13). The X-ray detection part (20) detects the X-ray beam. The revolution drive mechanism performs X-ray imaging by revolving the X-ray generation part (10) and the X-ray detection part (20) around the object while the X-ray generation part (10) and the X-ray detection part (20) are opposed to each other with said object interposed therebetween. The X-ray imaging apparatus (100) controls a restriction part (15) to thereby restrict an X-ray transmission in such a manner that the focal spot size of an X-ray beam (BX2) used in X-ray CT imaging of a relatively narrow imaging region (R2) can be smaller than the focal spot size of an X-ray beam (BX1) used in X-ray CT imaging of a relatively large imaging region (R2).
