To maintain the stable motion state by suppressing floating and rattling of a movable partition wall in a material handling device in which a floor plate made longitudinally movable by a cylinder is arranged, the floor plate is only moved at engagement and the movable partition wall moved with the floor plate at movement is provided on the floor plate as a material handling device provided in a box body for storing a load and delivering the load.

The movable partition wall 12 has a base part 32 with width in a longitudinal direction and is further a trapezoidal shape for inclining/falling a joint surface of the load A and having longitudinal width diameter upwardly contracted. Further, a projection 34 having a forwardly descending inclination surface 35 is provided to protrude on the base part 32.

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