In an X-ray apparatus 1 in which an FPD 4 moves independently of an X-ray tube 3, an X-ray irradiation area discriminator 33 discriminates, for separate X-raying actions, X-ray irradiation area images G2 from among X-ray images G1 outputted from the FPD 4. An X-ray tube position sensor 31 acquires position information P on the X-ray tube 3 for the separate X-raying actions. A long image creator 35 creates a long image G3 by shifting the X-ray irradiation area images G2 based on the position information P, and splicing the X-ray irradiation area images G2 together. Therefore, even when a relative position between the X-ray tube 3 and FPD 4 is variable instead of being constant, the X-ray irradiation area images G2 can be obtained reliably, and these can be spliced together with high accuracy. There is no need to uniform starting timing and moving speed of the X-ray tube 3 and FPD 4, which simplifies control.
