A conveyance apparatus aligns conveyed packaging bags. In the conveyance apparatus, a thickness measurement part measures the thickness of a packaging bag. A controller infers that the width of the packaging bag has decreased when the thickness of the packaging bag is greater than a reference thickness, and the controller causes a first guide member to move so as to approach a second guide member via a guide drive part. In addition, the controller infers that the width of the packaging bag has increased when the thickness of the packaging bag is less than the reference value, and the controller causes the first guide member to move so as to be distanced from the second guide member via the guide drive part.