An X-ray imaging apparatus includes an X-ray sensor configured to convert an X-ray to an image signal, a supporting member configured to support the X-ray sensor, and a casing having the X-ray sensor and the supporting member incorporated therein, wherein the casing includes a front casing configured to cover a front surface of the X-ray imaging apparatus where an X-ray enters, and a rear casing configured to cover a rear surface opposite the front surface of the X-ray imaging apparatus, and wherein a recess is formed toward the exterior of the casings at the connection portion of the front casing and the rear casing.
