To provide an article group stacking device capable of efficiently performing stacking work.

This article group stacking device 1 is provided with a liftable/lowerable conveyance means 11 receiving an article group A in an alignment pattern from an article group formation means 3 and conveying the article group A to a conveyance direction. The article group stacking device 1 is provided with a support means 21 horizontally movable between a stacking position and a receiving position. The support means 21 receives and supports the article group A while situated in the receiving position by lowering of the conveyance means 11. By horizontally moving the support means 21 to the stacking position, the article group A is conveyed to the same direction as the conveying direction of the conveyance means 11. When the support means 21 is returned to the receiving position, the article group A is fallen down along an article group four-face outer periphery guide means 40.