An X-ray detecting device includes a lower case, a driving circuit substrate on the lower case, an X-ray detection panel connected with the driving circuit substrate, the X-ray detection panel being adapted to detect X-rays applied from the outside by converting the X-rays into electricity, a touch panel on the X-ray detection panel, and an upper case on the touch panel. The driving circuit substrate is provided with a driving circuit. The driving circuit is electrically connected with the X-ray detection panel and the touch panel and is adapted to control the driving of the X-ray detection panel and the touch panel.