PROBLEM TO BE SOLVED: To facilitate synchronization when using cableless digital X-ray detection means and communication with an X-ray imaging system.SOLUTION: An X-ray imaging apparatus comprises a plurality of two-dimensional X-ray detectors 11, 16 and a system controller 31 capable of performing wireless communication. The X-ray detectors 11, 16 and the system controller 31 can be physically connected with each other easily. At the connection, the system controller 31 gives an individual ID key to each of the X-ray detectors 11, 16, and performs wireless communication on the basis of the individual ID keys for X-ray imaging.SELECTED DRAWING: Figure 1