A receiving device in which detectors of different sizes can be stably accommodated and an X-ray imaging apparatus having the same are provided. A receiving device having a receiving unit in which a first detecting device is accommodated. The receiving device includes a fixing unit provided in the receiving unit and into which a part of a side surface of the first detecting device is inserted in order to prevent the first detecting device from being moved; and a detector support having a side that is connected to a rotating shaft and tiltable, and configured to support at least one side surface of a second detecting device having a smaller size than the first detecting device.