To provide a device capable of gently shifting a bag from an erected posture to a laid one in a controlled state.

This device handles the bag conveyed in the erected posture on a first conveyer and in the laid posture on a second conveyer. A conveyance device for handling the self-supported bag in particular is provided between the first and the second conveyer so as to handle the bag carefully and to be fitted for handling the self-supporting bag in particular. The first conveyer is provided with a shifting part turning the bag in an approximately horizontal direction in the air and the conveyance device is provided with a mount face forming a row of the laid bags, a holding means drawing out the bag from the first conveyer onto the mount face by an approximately linear movement, and a delivery means moving the bag row to the second conveyer.