An X-ray imaging device, comprising: a camera configured to acquire a first image of an object; an X-ray generator for generating X-rays; an X-ray irradiation region controller disposed in front of the X-ray generator and configured to control an X-ray irradiation region of the object to which the X-rays are irradiated; a display member using a touch screen to display the first image outputted from the camera and an image of the X-ray irradiation region, wherein the display member is configured to provide a user of the X-ray imaging device with a user interface that is divided into a plurality of regions (41, 47), wherein the display member is configured to: display the first image in a region of the user interface, along with a list of X-ray imaging parts in another region of the user interface; receive a selection of one of the X-ray imaging parts from the list of the X-ray imaging parts that is displayed; display, based on the selection of the one of the X-ray imaging parts, in the region of the user interface, a second image of the X-ray irradiation region such that the second image of the X-ray irradiation region overlaps the first image; receive a first input for adjusting a size of the second image that is displayed; and adjust the size of the second image that is displayed, based on the first input that is received. a camera configured to acquire a first image of an object; an X-ray generator for generating X-rays; an X-ray irradiation region controller disposed in front of the X-ray generator and configured to control an X-ray irradiation region of the object to which the X-rays are irradiated; a display member using a touch screen to display the first image outputted from the camera and an image of the X-ray irradiation region, wherein the display member is configured to provide a user of the X-ray imaging device with a user interface that is divided into a plurality of regions (41, 47), wherein the display member is configured to: display the first image in a region of the user interface, along with a list of X-ray imaging parts in another region of the user interface; receive a selection of one of the X-ray imaging parts from the list of the X-ray imaging parts that is displayed; display, based on the selection of the one of the X-ray imaging parts, in the region of the user interface, a second image of the X-ray irradiation region such that the second image of the X-ray irradiation region overlaps the first image; receive a first input for adjusting a size of the second image that is displayed; and adjust the size of the second image that is displayed, based on the first input that is received. display the first image in a region of the user interface, along with a list of X-ray imaging parts in another region of the user interface; receive a selection of one of the X-ray imaging parts from the list of the X-ray imaging parts that is displayed; display, based on the selection of the one of the X-ray imaging parts, in the region of the user interface, a second image of the X-ray irradiation region such that the second image of the X-ray irradiation region overlaps the first image; receive a first input for adjusting a size of the second image that is displayed; and adjust the size of the second image that is displayed, based on the first input that is received.