Abstract: A mobile type radiography apparatus having a truck movable on a floor, an X-ray control unit mounted on the truck, a first supporting arm having two branches supporting an X-ray generator and an X-ray image reception device at mutually opposite positions to sandwich a subject between the X-ray generator and the X-ray image reception device, an arm supporting mechanism having a second arm extending toward an outside of the branches of the first supporting arm and supporting the first supporting arm so as to be movable. A supporting pole mechanism is mounted on the truck so as to extend upwardly therefrom and an arm motion mechanism is located between the arm supporting mechanism and the supporting pole mechanism for linearly supporting the arm supporting mechanism so as to enable movement of the first supporting arm in horizontal directions perpendicular to longitudinal directions of the second arm.