To provide a container group stacking apparatus and stacking method capable of stably stacking, with a simple apparatus structure, a group of containers on a pallet without damaging containers of various shapes, materials, rigidity and weights or without being influenced by a dimensional difference, aligning state disorder or chipping of any of the group of containers in various arrays.

The container group stacking apparatus 1 is provided with a suction head 2 adaptable to various types of containers and a retaining and conveying apparatus 10 having moving means for the suction head and negative pressure supply means 4 to move the suction head 2 of the retaining and conveying apparatus 10 with the moving means for a series of stacking operations. That is to say, the group of containers aligned on a multi-line stage 22 are sucked and retained by the suction head 2 and are then moved on a separate sheet supplied by a separate sheet feeder 23. Subsequently, the separate sheet is further sucked and retained on the lower side of each of the group of containers sucked and retained by the suction head 2 and is then conveyed on the pallet 20 and both thereof are stacked together on the pallet 20. The operation is repeated to complete stacking.