Abstract: An X-ray photographic holder adapted to use a cassette includes a carriage having the cassette placed thereon, which is reciprocally movable between a cassette loading position and a radiographic position. On the carriage a pair of grippers are provided movable in the direction perpendicular to the carriage movement. An endless belt is driven by a motor, guided by pulleys provided on the carriage and engaged with the grippers. The carriage is stopped from moving by a stopper means so long as in the cassette loading position. In this state the cassette can be gripped by the grippers so to be set in a fixed position. After this positioning, the stopper means is released to move the carriage so that the center of the cassette can be brought to a radiographic position.