To eliminate reversing defect and noise when containers fall by dispensing with a reversing device by enabling the reversing of the containers while conveying the containers.

This container stacker device has an inlet conveyor 1, a lifting device 2 for lifting up each container A carried into the inlet conveyor 1, a container reversing and conveying device 3 for reversing each container A having an upstream end part located on an upper side of the lifting device 2, while conveying the container A one by one, a container positioning device 4 located on a lower side of a downstream end part of the container reversing and conveying device 3, a container stacking device provided at a lower position of the container positioning device 4 to be successively movable downward, and a container discharge conveyor 6 for discharging the containers AS stacked in the container stacking device.