An X-ray photographing apparatus comprising: an X-ray generator configured to generate an X-ray; an X-ray detector configured to detect the X-ray that is transmitted through an object; and a panel (32; 34) that is provided between the X-ray generator and the X-ray detector and configured to contact the object, wherein the X-ray photographing apparatus is configured such that a distance between a center axis of the X-ray generator and the X-ray detector is maintained to be uniform during a time period, and a radiation angle of the X-ray generated by the X-ray generator with respect to the object changes over the time period, characterized in that the X-ray generator comprises: a plurality of electron emission devices configured to emit electrons; and an anode electrode configured to generate the X-ray by using the emitted electrons, wherein the radiation angle differs according to a thickness of the anode electrode. wherein: the anode electrode comprises a region having a regular thickness and a region having an irregular thickness, the X-ray generated in the region of the anode electrode having the regular thickness is vertically radiated to the object, and the X-ray generated in the region of the anode electrode having the irregular thickness is radiated to the object in an inclined fashion. an X-ray generator configured to generate an X-ray; an X-ray detector configured to detect the X-ray that is transmitted through an object; and a panel (32; 34) that is provided between the X-ray generator and the X-ray detector and configured to contact the object, wherein the X-ray photographing apparatus is configured such that a distance between a center axis of the X-ray generator and the X-ray detector is maintained to be uniform during a time period, and a radiation angle of the X-ray generated by the X-ray generator with respect to the object changes over the time period, characterized in that the X-ray generator comprises: a plurality of electron emission devices configured to emit electrons; and an anode electrode configured to generate the X-ray by using the emitted electrons, wherein the radiation angle differs according to a thickness of the anode electrode. wherein: the anode electrode comprises a region having a regular thickness and a region having an irregular thickness, the X-ray generated in the region of the anode electrode having the regular thickness is vertically radiated to the object, and the X-ray generated in the region of the anode electrode having the irregular thickness is radiated to the object in an inclined fashion. a plurality of electron emission devices configured to emit electrons; and an anode electrode configured to generate the X-ray by using the emitted electrons, wherein the radiation angle differs according to a thickness of the anode electrode. wherein: the anode electrode comprises a region having a regular thickness and a region having an irregular thickness, the X-ray generated in the region of the anode electrode having the regular thickness is vertically radiated to the object, and the X-ray generated in the region of the anode electrode having the irregular thickness is radiated to the object in an inclined fashion. the anode electrode comprises a region having a regular thickness and a region having an irregular thickness, the X-ray generated in the region of the anode electrode having the regular thickness is vertically radiated to the object, and the X-ray generated in the region of the anode electrode having the irregular thickness is radiated to the object in an inclined fashion.