Abstract: An X-ray photographic inspecting device for inspecting a welded part such as, for example, a vertical welded part on a wall to be inspected like the wall of a metal tank, which has a body movable at the upper edge of the wall to be inspected and supported by a supporting leg on the wall to be inspected, an X-ray generator elevationally and movably hung at a guide rail vertically provided at the body, and a radiological transmitter mounted on a support provided at the X-ray generator. This entire device can be operated by a single worker or operator by an operational panel on a gondola, which drives the X-ray generator and the gondola, fixing the body to the wall with magnets or releasing the fixture of the body, urging the transmitter onto the wall to be inspected, bonding the film on the opposite side of the wall to be inspected, and carrying out the X-ray photographing of the welded part on the wall to be inspected.