A bucky tray for an X-ray imaging apparatus includes a first plate on which an X-ray detecting device is mountable, and a second plate configured to be coupled to the first plate to be movable to at least one of a first location where the X-ray detecting device of a first size is accommodated and a second location where another X-ray detecting device of a second size is accommodated. The X-ray detecting device is configured to be mounted on the bucky tray.