To carry a stage-stacked stacking body formed by stacking packing objects without collapse of a load stack.

This stacking body supply device 1 stores a plurality of packing objects B as the stage-stacked stacking body C by stacking in a bucket 10, and carries the stage-stacked stacking body C to the downstream side from the upstream side. The stacking body supply device 1 has a pushing-out pusher 20 for pushing out this stage-stacked stacking body C from the bucket 10 in the orthogonal direction to the carrying direction of a bucket conveyor 11 from a downstream pushing-out position Z of the bucket conveyor 11. The pushing-out pusher 20 includes a front wall 23 arranged on a front face in the pushing-out direction of the stage-stacked stacking body C, and a rear wall 24 arranged on a rear surface in the pushing-out direction of the stage-stacked stacking body C. After arranging these front wall 23 and rear wall 24 in the bucket 10, the stage-stacked stacking body C is pushed out.

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