To stow easily deformable bag cargos in a stable state without damaging the bag cargos.

This palletizer is constituted of a carrier conveyor 2 for carrying a plurality of bag cargoes (a), an edge aligning device 3 for aligning an edge with a width capable of stowing on a cart 8 by pressing the bag cargoes (a) on the carrier conveyor 2 from the right and left, a transfer plate 4 for advancing-retreating between a transfer point of the bag cargoes (a) from the carrier conveyor 2 and an upper surface of the cart 8, a presser plate 5 for advancing up to the upper surface of the cart 8 together with the transfer plate 4 after assisting by pushing from the rear when the bag cargoes (a) transfer to the transfer plate 4 and retreating after being transferred on the cart 8 by pressing the rear of the bag cargoes (a) by temporarily stopping when the transfer plate 4 retreats, a driving device for operating the transfer plate 4 and the presser plate 5 for advancing-retreating in the timing, a lifting device 6 for lifting the cart 8 to a height position capable of transferring the bag cargoes (a) and lowering one stage by one stage every time when stowing the bag cargoes (a), and an exciter 7 for exciting and horizontally leveling an upper surface of the uppermost stage bag cargo (a) stowed on the cart 8.