| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging box wherein coupling between front and rear side plates and right and left side plates can be kept rigid even if a widthwise dimension of a beam plate is relatively small, and wherein as the widthwise dimension of the beam plate can be relatively small, it is easy to put in/out an object to be packaged and a material cost of a corrugated fiberboard can be reduced. SOLUTION: External side plates 4 and internal side plates 5 are overlaid and made to stand on the left and the right of a base plate 3. Side plates 8 are made to stand on the front and rear sides of the base plate 3. The beam plate 9 connected with the front and rear sides plates 8 is folded horizontally, and locking pieces 10 at both ends of the beam plate 9 are inserted into and locked with locking holes 21 between the external side plate 4 and the internal side plate 5. A protrusion 12 is provided on a first tab connected with the external side plate 4 or on a second tab connected with the internal side plate 5, and the protrusion 12 is inserted into an insertion hole 13 formed on the beam plate 9 for hooking. |
