To provide an innovative bag body supporting device with a high commercial value.

This bag body supporting device includes a bag body opening holding portion 2 for holding an opening 1a of the bag body 1 in an opened state, and a support portion 3 for supporting the bag body opening holding portion 2 in a prescribed height position. The support portion 3 makes the bag body opening holding portion 2 supported by a plurality of erected support bodies 4 put into the state of being erected on the periphery of the bag body 1 held by the bag body opening holding portion 2.