To provide a product stacker capable of stacking empty containers rapidly and stably.SOLUTION: A product stacker is adapted such that a produced empty container 1 is sucked by a suction pad 32 of a carrier robot 30 and carried to a predetermined height immediately above a to-be-stacked point 21a of a belt conveyor 20, and then released from being sucked and allowed to fall into stacking over a container 1 stacked on the to-be-stacked point 21a. Because the internal air of the container 1 is sucked by one pair of first suction units 40 arranged left and right of the belt conveyor 20 and a second suction unit 50 incorporated in the belt conveyor 20, the container 1 falls at speed while keeping a stable position.SELECTED DRAWING: Figure 2

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