A method of producing a packing body comprising the steps of: stacking a plurality of packaging bodies, each having an upper surface, a lower surface, and side surfaces; placing reinforcing sheet materials comprising an upper reinforcing sheet material and a lower reinforcing sheet material so as to wrap outer peripheries of the side surfaces of the packaging bodies that have been stacked; and fastening the packaging bodies that have been stacked by placing fastening bands from an outer side of the reinforcing sheet materials, wherein the step of placing the reinforcing sheet materials includes placing the upper reinforcing sheet material on the side surfaces of the packaging bodies such that an end portion of the upper reinforcing sheet material protrudes from an upper surface of a packaging body in an uppermost layer and placing the lower reinforcing material on the side surfaces of the packaging bodies such that an end portion of the lower reinforcing sheet material protrudes from a lower surface of a packaging body in a lowermost layer, and wherein the step of fastening the packaging bodies that have been stacked includes bending the end portion of the upper reinforcing sheet material that protrudes from the upper surface of the packaging body in the uppermost layer and the end portion of the lower reinforcing sheet material that protrudes from the lower surface of the packaging body in the lowermost layer towards a side of an upper surface of the uppermost layer and towards a side of a lower surface of the lowermost layer, respectively, covering an edge portion of each packaging body, and placing the fastening bands on the edge portions with the upper and lower reinforcing sheet materials interposed therebetween. stacking a plurality of packaging bodies, each having an upper surface, a lower surface, and side surfaces; placing reinforcing sheet materials comprising an upper reinforcing sheet material and a lower reinforcing sheet material so as to wrap outer peripheries of the side surfaces of the packaging bodies that have been stacked; and fastening the packaging bodies that have been stacked by placing fastening bands from an outer side of the reinforcing sheet materials, wherein the step of placing the reinforcing sheet materials includes placing the upper reinforcing sheet material on the side surfaces of the packaging bodies such that an end portion of the upper reinforcing sheet material protrudes from an upper surface of a packaging body in an uppermost layer and placing the lower reinforcing material on the side surfaces of the packaging bodies such that an end portion of the lower reinforcing sheet material protrudes from a lower surface of a packaging body in a lowermost layer, and wherein the step of fastening the packaging bodies that have been stacked includes bending the end portion of the upper reinforcing sheet material that protrudes from the upper surface of the packaging body in the uppermost layer and the end portion of the lower reinforcing sheet material that protrudes from the lower surface of the packaging body in the lowermost layer towards a side of an upper surface of the uppermost layer and towards a side of a lower surface of the lowermost layer, respectively, covering an edge portion of each packaging body, and placing the fastening bands on the edge portions with the upper and lower reinforcing sheet materials interposed therebetween.