PURPOSE: To always push out a DP bag in a standing state to a takeout port side by absorbing a thickness difference between upper and lower parts caused by the slip file of the DP bag by the projecting amount of a curved plate.

CONSTITUTION: Plural DP bags 30 are housed in the standing state in a stocker 33. The DP bag 30 is sucked and taken out by a sucking pad 54 from the takeout port of the stocker 33. A back plate 50 is provided on the back surface side of the DP bag 30. The back plate 50 is attached to a bracket 51 in a nearly center part so as to freely turn centering around a horizontal shaft 68. The curved plate 70 is provided at a lower position than the horizontal shaft 68 on the back plate 50. The bracket 51 is movably guided in the stocker 33 by a guide plate 52 and a guide roller 72. The back plate 50 is pressed to the takeout port side by a weight 75.