An X-ray photography apparatus, comprising a main body that includes an X-ray generation part and an X-ray detection part, wherein the X-ray generation part is configured to emit an X-ray beam including a bundle of X-rays toward a subject and the X-ray detection part is configured to detect the emitted X-ray beam after it has been transmitted through the subject (Ml); a turning arm for supporting the X-ray generation part and the X-ray detection part; a vertically extending pillar; an elevating part configured to be vertically elevated with respect to the pillar while suspending the turning arm; a beam forming mechanism of the X-ray generation part; wherein the elevating part and the beam forming mechanism are configured to relatively change an irradiation direction of the X-ray beam to a head of the subject with respect to an axial direction of a body axis of the subject; the beam forming mechanism forms the X-ray beam into an X-ray slit beam for panoramic photography; the irradiation direction during panoramic photography is controlled such that a center axis of the X-ray beam is oriented upward with respect to a direction orthogonal to the axial direction of the body axis; the beam forming mechanism forms the X-ray beam into an X-ray cone beam for CT photography; characterised in that the apparatus is adapted such that, if CT photography of a first photographic region that includes both an upper jaw and a lower jaw of the head of the subject is set, the irradiation direction is controlled such that the first photographic region is irradiated with the X-ray beam such that the center axis of the X-ray beam passes through the center of the first photographic region, and such that the center axis is orthogonal to the body axis; and if CT photography of a second photographic region that includes only the upper jaw or of a third photographic region that includes only the lower jaw is set, the irradiation direction is controlled such that the second or third photographic region (FOV2, FOV3) is irradiated with the X-ray beam such that the center axis of the X-ray beam passes through the center of the respective one of the second or third photographic region (FOV2, FOV3), and such that the center axis is orthogonal to the body axis. an X-ray generation part and an X-ray detection part, wherein the X-ray generation part is configured to emit an X-ray beam including a bundle of X-rays toward a subject and the X-ray detection part is configured to detect the emitted X-ray beam after it has been transmitted through the subject (Ml); a turning arm for supporting the X-ray generation part and the X-ray detection part; a vertically extending pillar; an elevating part configured to be vertically elevated with respect to the pillar while suspending the turning arm; a beam forming mechanism of the X-ray generation part; wherein the elevating part and the beam forming mechanism are configured to relatively change an irradiation direction of the X-ray beam to a head of the subject with respect to an axial direction of a body axis of the subject; the beam forming mechanism forms the X-ray beam into an X-ray slit beam for panoramic photography; the irradiation direction during panoramic photography is controlled such that a center axis of the X-ray beam is oriented upward with respect to a direction orthogonal to the axial direction of the body axis; the beam forming mechanism forms the X-ray beam into an X-ray cone beam for CT photography; characterised in that the apparatus is adapted such that, if CT photography of a first photographic region that includes both an upper jaw and a lower jaw of the head of the subject is set, the irradiation direction is controlled such that the first photographic region is irradiated with the X-ray beam such that the center axis of the X-ray beam passes through the center of the first photographic region, and such that the center axis is orthogonal to the body axis; and if CT photography of a second photographic region that includes only the upper jaw or of a third photographic region that includes only the lower jaw is set, the irradiation direction is controlled such that the second or third photographic region (FOV2, FOV3) is irradiated with the X-ray beam such that the center axis of the X-ray beam passes through the center of the respective one of the second or third photographic region (FOV2, FOV3), and such that the center axis is orthogonal to the body axis.