An upright posture assisting device for an X-ray inspection of infants, and more particularly to an upright posture assisting device for an X-ray inspection of infants, by which an infant can be X-ray photographed while being safely fixed. The upright posture assisting device for an X-ray inspection of infants includes: a body disposed on the front side of an X-ray detector and having an empty space in the interior thereof； an insertion hole formed on the upper surface of the body such that the legs of an infant are inserted into the insertion hole； and handgrip parts mounted on opposite sides of the upper surface of the body.
