To establish an unmanned palletizing operation without using a robot etc. on a large scale.

A palletizing device to stack objects on a receptacle tool is equipped with a conveyor device having an object ejecting hole in the downstream and a self-propelled carriage composed of a mobile platform and an object receiving part installed on the platform movably in the plumb direction and furnished at the oversurface with a weight sensing means, wherein the carriage is furnished with an input means to enter the data of the object and a control means to conduct the movement of the platform and/or movement in the plumb direction of the object receiving part on the basis of the data fed from the input means and the weight and position data of the stacked object given by the weight sensing means.