There are provided a receiving device in which detectors of different sizes can be stably accommodated and an X-ray imaging apparatus having the same. A receiving device having a receiving unit in which a first detecting device is accommodated, the receiving device including a fixer provided in the receiving unit and into which a part of a surface of the first detecting device is inserted in order to prevent movement of the first detecting device, and a guide disposed at an inner side surface of the receiving unit and including a detector support having a side that is connected to a rotating shaft to be rotatable and configured to support at least one surface of the first detecting device and at least one surface of a second detecting device having a different size from the first detecting device.
