Packing box

Abstract

To provide a packaging box having sufficient strength by suppressing buckling caused by break lines for opening.SOLUTION: A packaging box comprises a pair of first sidewalls facing to the first direction, a shank having a top wall connecting upper ends of the pair of the first sidewalls and bottom wall connecting lower ends of the pair of the first sidewalls, and a pair of second sidewalls facing to the second direction orthogonal to the vertical direction and the first direction and closing an opening part of the shank. The packaging box has a first break line provided to the first edge line of a boundary of the first sidewalls positioned at one side in the first direction and the top wall, a second break line provided to the second edge line of a boundary of the first sidewalls positioned at one side in the first direction and the bottom wall, and a third break line provided to a center in the lateral direction in the first sidewalls positioned at one side in the first direction and extended in the longitudinal direction between the first break line and the second break line. The first sidewalls broken by the first, second and third break lines is rotatable by using the third edge line positioned at one end in the first direction in the second sidewalls and longitudinally extended, as a hinge.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] A typical packaging box is a wrap-around type that is a rectangular parallelepiped that is a square shape when viewed from above. However, when the contents to be packed inside the box are cylindrical containers, the space at the corners becomes so-called dead space. Patent Document 1 discloses a wrap-around packaging box that is rectangular parallelepiped with four corners beveled at an angle and has an octagonal shape when viewed from above.

[0003] The packaging box of Patent Document 1 has tray-forming cutout lines extending laterally from both sides of an opening start opening formed in the approximate center of the side panel toward the inner flap side. In Patent Document 1, the tray-forming cut line is torn to open a part of the side panel, and the outer flap is peeled off from the inner flap, thereby dividing the packaging box into two parts, upper and lower. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-91799 Summary of the Invention [Problem to be solved by the invention]

[0005] In the packaging box of Patent Document 1, the tray-forming cutout lines extend laterally on the side panels, which can cause buckling in the side panels and reduce the strength of the packaging box.

[0006] The present invention has been made in consideration of the above points, and an object of the present invention is to provide a packaging box that has sufficient strength and that is prevented from buckling due to a breaking line for opening. [Means for solving the problem]

[0007] The present invention has the following aspects. [1] A container having a pair of first side walls facing each other in a first direction, a top wall connecting the upper ends of the pair of first side walls, and a body having a bottom wall connecting the lower ends of the pair of first side walls, and a pair of second side walls facing each other in a second direction perpendicular to the up-down direction and the first direction and closing an opening of the body, wherein a first break line is provided on a first ridge line of a boundary between the first side walls and the top wall located on one side of the first direction, and a first break line is provided on a first ridge line of a boundary between the first side walls and the bottom wall located on one side of the first direction. a second break line provided at a second ridge line of the boundary, and a third break line provided at the center in the second direction of the first side wall located on one side in the first direction and extending vertically between the first break line and the second break line, wherein the first side wall broken at the first break line, the second break line, and the third break line is located at an end of the second side wall on one side in the first direction and is rotatable around the third ridge line extending vertically as a hinge portion. [2] The packaging box described in [1], wherein the top wall and the bottom wall are octagonal in plan view with oblique sides at the corners, and each has an outer flap that forms part of the second side wall, and the pair of first side walls each have inner flaps that are connected via connecting walls on both sides in the second direction and form part of the second side wall, and the connecting walls are folded along the oblique sides between the first side wall and the inner flaps. [3] The packaging box according to [1] or [2], wherein the first side wall located on one side of the first direction has a handle portion that forms an opening when pushed in, and a portion of the opening is formed by the third break line. [4] The packaging box described in [3] above, which has a cutting means arranged around the entire circumference, including the inner surfaces of the pair of first side walls and the inner surfaces of the pair of second side walls, and a part of the cutting means is arranged on the inner surface of the handle portion. [Effects of the Invention]

[0008] The present invention can provide a packaging box that is sufficiently strong and that is prevented from buckling due to a breaking line for opening. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a packaging box 1 according to an embodiment of the present invention. [Figure 2] FIG. 1 is a plan view showing a blank sheet for a packaging box of the present invention, arranged so that the inner surface is visible. [Figure 3] 10 is a partially enlarged view of a third break line H3 provided on the first side wall 11. FIG. [Figure 4] 10 is a perspective view seen from the first side wall 11 side, showing a procedure for unsealing the first side wall 11. FIG. [Figure 5] 10 is a perspective view seen from the first side wall 11 side, showing a procedure for unsealing the first side wall 11. FIG. [Figure 6] 10 is a perspective view seen from the first side wall 11 side, showing a procedure for unsealing the first side wall 11. FIG. [Figure 7] FIG. 2 is a perspective view of the packaging box 1 separated into upper and lower halves. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of a packaging box of the present invention will be described with reference to FIGS. The following embodiment shows one aspect of the present invention, does not limit the present invention, and can be modified as desired within the scope of the technical concept of the present invention. In addition, in the following drawings, the scale and number of each structure are different from the actual structure to make each configuration easier to understand.

[0011] FIG. 1 is a perspective view of a packaging box 1. FIG. The packaging box 1 is a box body having an octagonal decahedron shape in a plan view. The packaging box 1 is a box body made of paper such as cardboard. Hereinafter, the up and down directions are defined assuming that the packaging box 1 is placed on a horizontal surface.

[0012] As shown in Figure 1, packaging box 1 includes a body 10 having a pair of first side walls 11, 12, a top wall 30, and a bottom wall 20, a pair of second side walls 13, 14 closing the opening of body 10, connecting walls 2, 3, 4, 5, a third break line H3, a handle 17, and cutting means T1, T2. The pair of first side walls 11, 12 face each other in a first direction. The pair of second side walls 13, 14 face each other in a second direction perpendicular to the up-down direction and the first direction.

[0013] In the following description, the direction in which the pair of first side walls 11, 12 face each other is referred to as the Y direction, the direction in which the pair of second side walls 13, 14 face each other is referred to as the X direction, and the direction perpendicular to the X and Y directions is referred to as the Z direction. The Y direction corresponds to the first direction. The X direction corresponds to the second direction. The Z direction is the up-down direction and corresponds to the vertical direction. The Z direction is referred to as the upper side and the lower side as appropriate. In the Y direction, the +Y side is referred to as the right side and the -Y side is referred to as the left side. The right side corresponds to one side of the first direction. The left side corresponds to the other side of the first direction. In the X direction, the +X side is referred to as the front side and the -X side is referred to as the rear side. Note that the terms "up and down direction," "upper side," "lower side," "right side," "left side," "front side," and "rear side" are simply names used to describe the relative positions of the various parts in the posture shown in FIG. 1, and the actual relative positions may be other than those indicated by these names.

[0014] The packaging box 1 is formed by mountain or valley folding a blank sheet S cut out from a single sheet of cardboard, as shown in Fig. 2. The blank sheet S shown in Fig. 2 is arranged so that the outer surface is visible. Each of the creases (fold lines) that separate the first side walls 11, 12, the second side walls 13, 14, the bottom wall 20 (see Figure 1), and the top wall 30 (see Figure 1) of the blank sheet S is a linear groove formed by pressing the inner surface of the blank sheet S. It is also possible to form slits (such as half-cut lines) in the ruled lines, which makes it easier to fold the blank sheet S at the ruled lines.

[0015] The first side walls 11 and 12 are formed in a rectangular shape in a plan view. The first side walls 11 and 12 have a larger area than the other pair of second side walls 13, 14, the top wall 30, and the bottom wall 20 of the decahedral packaging box 1.

[0016] The top wall 30 is connected to the upper edge of the first side wall 11 located on the right side via a first break line H1 (see FIG. 2). The first break line H1 is provided on a first ridge line R1 at the boundary between the first side wall 11 and the top wall 30. The bottom wall 20 is connected to the lower edge of the first side wall 11 via a second break line H2 (see FIG. 2). The second break line H2 is provided on a second ridge line R2 at the boundary between the first side wall 11 and the bottom wall 20.

[0017] The top wall 30 connects the upper ends of the pair of first side walls 11, 12. In a plan view, the top wall 30 is an octagon with hypotenuses 30a at the corners. The hypotenuses 30a connect the ends of adjacent long and short sides of the top wall 30. The hypotenuses 30a intersect with the adjacent long and short sides of the top wall 30 at an angle of 45°.

[0018] The bottom wall 20 connects the lower ends of the pair of first side walls 11, 12. In a plan view, the bottom wall 20 is an octagon with hypotenuses 20a at the corners. The hypotenuses 20a connect the ends of adjacent long and short sides of the bottom wall 20. The hypotenuses 20a intersect with the adjacent long and short sides of the bottom wall 20 at an angle of 45°. The bottom wall 20 has the same shape as the top wall 30 in a plan view. The first side wall 12 is connected to the left edge of the bottom wall 20 via a line L1 (see FIG. 2).

[0019] A joining piece 15 is provided along a line L2 (see FIG. 2) on the upper edge of the first side wall 12. The joining piece 15 is formed in a strip shape along the upper edge of the first side wall 12. The joining piece 15 is a portion that is joined by an adhesive to the left end of the inner surface of the top wall 30. The joining piece 15 may be subjected to a step-flattening process as necessary.

[0020] By folding the blank sheet S as described above along the first break line H1, the second break line H2 and the line L1-L2, and joining the joining piece 15 to the left inner surface of the top wall 30, a rectangular cylindrical body 10 is formed by the top wall 30, the first side wall 11, the bottom wall 20 and the first side wall 12.

[0021] The opening on the front side of the body portion 10 is closed by a second side wall 13. The opening on the rear side of the body portion 10 is closed by a second side wall 14. As shown in FIG. 1, the second side wall 13 is composed of left and right inner flaps 13A and 13B, an outer flap 31, and an outer flap 21.

[0022] The inner flap 13A is connected to the front side of the first side wall 11 in the second direction via a connecting wall 2. The connecting wall 2 is connected to the front side of the first side wall 11 in the second direction via a crease L3. The connecting wall 2 is bent along the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20 between the first side wall 11 and the inner flap 13A. The connecting wall 2 overlaps with the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20 in a plan view. Both ends of the connecting wall 2 in the up-down direction face the top wall 30 and the bottom wall 20 without being fixed to the top wall 30 and the bottom wall 20. The inner flap 13A is connected to the front side of the connecting wall 2 in the second direction via a crease L4. Therefore, the connecting wall 2 can rotate relative to the inner flap 13A, with the crease L4, which is located at the right end of the inner flap 13A of the second side wall 13 and forms the third ridge R3 extending vertically, acting as a hinge.

[0023] The inner flap 13B is connected to the front side of the first side wall 12 in the second direction via a connecting wall 3. The connecting wall 3 is connected to the front side of the first side wall 12 in the second direction via a crease L5. The connecting wall 3 is bent between the first side wall 12 and the inner flap 13B along the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20. The connecting wall 3 overlaps with the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20 in a plan view. Both ends of the connecting wall 3 in the up-down direction face the top wall 30 and the bottom wall 20 without being fixed to the top wall 30 and the bottom wall 20. The inner flap 13B is connected to the front side of the connecting wall 3 in the second direction via a crease L6. Therefore, the connecting wall 3 is rotatable relative to the inner flap 13B, with the crease L6, which is located at the left end of the inner flap 13B of the second side wall 13 and forms the third ridge R3 extending vertically, acting as a hinge.

[0024] The outer flap 31 is connected to the front edge of the top wall 30 via a crease L7. The outer flap 31 is folded downward from the top wall 30 along the crease L7. The outer flap 21 is connected to the front edge of the bottom wall 20 via a crease L8. The outer flap 21 is folded upward from the bottom wall 20 along the crease L8.

[0025] The left and right inner flaps 13A, 13B are butted together in the first direction, and the outer flaps 31 and 21 are folded, overlapped and pasted in front of the inner flaps 13A, 13B to form the second side wall 13. The second side wall 13 has hand holes 13C in the outer flap 31 and the inner flaps 13A and 13B, which form openings when pressed together.

[0026] The second side wall 14 is composed of left and right inner flaps 14A, 14B, an outer flap 32, and an outer flap 22. The inner flap 14A is connected to the rear side of the first side wall 11 in the second direction via a connecting wall 4. The connecting wall 4 is connected to the rear side of the first side wall 11 in the second direction via a crease L9. The connecting wall 4 is bent between the first side wall 11 and the inner flap 14A along the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20. The connecting wall 4 overlaps with the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20 in a plan view. Both ends of the connecting wall 4 in the up-down direction face the top wall 30 and the bottom wall 20 without being fixed to the top wall 30 and the bottom wall 20. The inner flap 14A is connected to the rear side of the connecting wall 4 in the second direction via a crease L10. Therefore, the connecting wall 4 is rotatable relative to the inner flap 14A, with the crease L10, which is located at the right end of the inner flap 14A of the second side wall 14 and forms the third ridge R3 extending vertically, acting as a hinge.

[0027] The inner flap 14B is connected to the rear side of the first side wall 12 in the second direction via a connecting wall 5. The connecting wall 5 is connected to the rear side of the first side wall 12 in the second direction via a crease L11. The connecting wall 5 is bent between the first side wall 12 and the inner flap 14B along the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20. The connecting wall 5 overlaps with the oblique side 30a of the top wall 30 and the oblique side 20a of the bottom wall 20 in a plan view. Both ends of the connecting wall 5 in the up-down direction face the top wall 30 and the bottom wall 20 without being fixed to the top wall 30 and the bottom wall 20. The inner flap 14B is connected to the rear side of the connecting wall 5 in the second direction via a crease L12. Therefore, the connecting wall 5 is rotatable relative to the inner flap 14B, with the ruled line L12, which is located at the left end of the inner flap 14B of the second side wall 14 and forms the third ridge line R3 extending vertically, acting as a hinge.

[0028] The outer flap 32 is connected to the rear edge of the top wall 30 via a crease L13. The outer flap 32 is folded downward from the top wall 30 along the crease L13. The outer flap 22 is connected to the front edge of the bottom wall 20 via a crease L14. The outer flap 22 is folded upward from the bottom wall 20 along the crease L14.

[0029] The second side wall 14 is formed by butting the left and right inner flaps 14A, 14B together in the first direction and folding, overlapping and pasting the outer flaps 32 and 22 behind the inner flaps 14A, 14B. The second side wall 14 has hand holes 14C in the outer flap 32 and the inner flaps 14A and 14B, which form openings when pressed together.

[0030] The third break line H3 is provided at the center of the first side wall 11 in the second direction. FIG. 3 is a partial enlarged view of the third break line H3 provided on the first side wall 11. As shown in FIG. 3, the third break line H3 extends in the vertical direction between the first break line H1 and the second break line H2. The break direction of the first break line H1 and the second break line H2 is a direction from the center of the first side wall 11 intersecting with the third break line H3 toward the outside in the second direction. The contour of the third break line H3 is a wave-like curve that extends in the vertical direction and displaces back and forth in the second direction. By having the third break line H3 extend in the vertical direction, the shear force when a load is applied in the vertical direction can be reduced compared to when the third break line H3 extends in the second direction, and buckling can be suppressed.

[0031] The handle 17 is formed on the first side wall 11, and when pressed in, forms an opening 17a. Two handles 17 are arranged spaced apart in the upward direction. Part of the opening 17a is formed by the third break line H3. Therefore, when the handhold portion 17 is pushed in to form the opening 17a, a part of the third rupture line H3 is exposed. The third rupture line H3 exposed in the opening 17a can be placed on the third rupture line H3 through the opening 17a.

[0032] The cutting means T1 and T2 are provided at portions to be cut on the packaging box 1. The cutting means T1 and T2 are, for example, a liner cutter, a zipper, or cutting tape. In the present invention, cutting tape that does not affect the strength of the packaging box 1 is most preferable. In the following description, the cutting means will be described as cutting tapes T1 and T2.

[0033] The cutting tapes T1 and T2 are made of, for example, resin. In the blank sheet S, the cutting tape T1 is horizontally arranged on the inner surface spanning the inner flap 13A, the connecting wall 2, the first side wall 11, the connecting wall 4, and the inner flap 14A. A portion of the cutting tape T1 is arranged on the inner surface of the handle portion 17 of the first side wall 11.

[0034] The cutting tape T2 is arranged horizontally on the inner surface extending from the inner flap 13B, the connecting wall 3, the first side wall 12, the connecting wall 5, and the inner flap 14B. The cutting tape T1 and the cutting tape T2 are positioned at the same vertical position. That is, the cutting tapes T1 and T2 are arranged along the entire horizontal periphery, including the inner surfaces of the pair of first side walls 11 and 12 and the pair of second side walls 13 and 14. The cutting tapes T1 and T2 of this embodiment are arranged along the entire horizontal periphery, including the inner surfaces of the pair of first side walls 11 and 12, the inner surfaces of the pair of second side walls 13 and 14, and the inner surfaces of the connecting walls 2, 3, 4, and 5.

[0035] The inner flap 13A where one end of the cutting tape T1 is located has a gripping portion 19A formed by a breaking line, and the inner flap 14A where the other end of the cutting tape T1 is located has a gripping portion 19B formed by a breaking line. The inner flap 13B where one end of the cutting tape T2 is located has a gripping portion 19C formed by a breaking line, and the inner flap 14B where the other end of the cutting tape T2 is located has a gripping portion 19D formed by a breaking line.

[0036] [Large opening formation] The procedure for opening the first side wall 11 of the packaging box 1 having the above-described structure will be described with reference to FIGS. 4 to 6 are perspective views of the packaging box 1 seen from the first side wall 11 side, showing the procedure for opening the first side wall 11.

[0037] When opening the first side wall 11, as shown in FIG. 4, the handle 17 is first pushed in to form the opening 17a. As a result, a portion of the third break line H3 is exposed on the +X side of the opening 17a, making it possible to place a hand through the opening 17a. In this embodiment, the third break line H3, which is curved and recessed in a direction concave toward the +X side, is exposed at an edge of the first side wall 11 that is located on the +X side of the third break line H3, making it easy to place a hand.

[0038] Next, place your hand on the third break line H3 exposed in the opening 17a and pull the first side wall 11 (first side wall 11a; see Figure 5) located on the +X side of the third break line H3 toward you (the +Y side). As a result, the third breaking line H3 is first broken starting from the position where it connects to the opening 17a. At this time, by pushing in the two handles 17 to form the opening 17a, the breaking operation can be performed using both hands, and the breaking work can be carried out efficiently.

[0039] When the breakage of the third break line H3 reaches the end in the vertical direction, by using your hand to move the first side wall 11 toward the +X side, the first break line H1 and the second break line H2, which are located on the +X side of the third break line H3, are continuously broken toward the +X side along with the breakage of the third break line H3.

[0040] Here, since both ends of the connecting wall 2 in the vertical direction are not fixed to the top wall 30 and the bottom wall 20, the connecting wall 2 rotates relative to the inner flap 13A using the ruled line L4, which is the third ridge line R3, as a hinge portion. As a result, as shown in FIG. 5, the first side wall 11 (first side wall 11a) located on the +X side of the third breaking line H3 is unsealed.

[0041] Next, the first side wall 11 (first side wall 11a) located on the +X side of the third break line H3 is opened, as well as the first side wall 11 (first side wall 11b) located on the -X side of the third break line H3.

[0042] First, the user places his / her hand on the third break line H3 of the first side wall 11b, on the first side wall 11b exposed at the opening 17a recessed on the -X side, and pulls the first side wall 11b towards him / her (+Y side). As a result, the first break line H1 and the second break line H2 located on the −X side of the third break line H3 in the first side wall 11b are continuously broken toward the −X side.

[0043] Here, since both ends of the connecting wall 4 in the vertical direction are not fixed to the top wall 30 and the bottom wall 20, the connecting wall 4 rotates relative to the inner flap 14A using the ruled line L10, which is the third ridge line R3, as a hinge portion. As a result, as shown in Figure 6, the first side wall 11b located on the -X side of the third break line H3 is opened, and a large opening is formed that includes not only the pair of second side walls 13, 14, the top wall 30 and the bottom wall 20, but also the connecting wall 2 and the connecting wall 4, making it easier to remove the contents.

[0044] [Separation of packaging box 1] FIG. 7 is a perspective view of the packaging box 1 separated into upper and lower parts. In the packaging box 1, by pinching at least one of the gripping portion 19A formed on the inner flap 13A and the gripping portion 19B formed on the inner flap 14A to cut out the area including the cut tape T1 in a strip, and by pinching at least one of the gripping portion 19C formed on the inner flap 13B and the gripping portion 19D formed on the inner flap 14B to cut out the area including the cut tape T2 in a strip, the packaging box 1 can be opened and separated into upper and lower halves to display the contents, as shown in Figure 7.

[0045] It is also possible to pinch the cut tape T1 exposed in the opening 17a formed by pushing the handle portion 17 without using the grip portions 19A and 19B, and cut off the area including the cut tape T1 in a strip shape.

[0046] As described above, in the packaging box 1 of this embodiment, the third fracture line H3 for opening the first side wall 11 extends vertically, so that compared to when it extends in the second direction, the shear force when a load is applied in the vertical direction can be reduced, buckling can be suppressed, and sufficient strength can be maintained.

[0047] In addition, in the packaging box 1 of this embodiment, a first break line H1 is provided on the first ridge line R1 at the boundary between the first side wall 11 and the top wall 30, a second break line H2 is provided on the second ridge line R2 at the boundary between the first side wall 11 and the bottom wall 20, and a third break line H3 is provided at the center of the first side wall in the second direction, extending vertically between the first break line H1 and the second break line H2.The first side wall 11 broken at the first break line H1, the second break line H2 and the third break line H3 can be rotated using the crease line L4 and the crease line L10, which form the third ridge line R3, as hinge sections, so that a large opening can be formed, making it easier to remove the contents.

[0048] Furthermore, the packaging box 1 of this embodiment has connecting walls 2, 3, 4, and 5 and is a wraparound type that is octagonal in plan view, so that even if the contents are cylindrical containers, the space at the corners (angles) can be prevented from becoming dead space, and a large opening can be formed that includes connecting walls 2 and 4 in addition to the first side wall 11, making it even easier to remove the contents.

[0049] Furthermore, in the packaging box 1 of this embodiment, the cutting means T1 is arranged on the inner surface of one of the two handle portions 17, and by having the handle portion 17 also serve as the opening portion of the cutting tape T1, there is no need to provide an H-shaped slit as the opening portion of the cutting tape T1, and a decrease in strength can be suppressed.

[0050] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to these examples. The shapes and combinations of the components shown in the above examples are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0051] For example, in the above embodiment, a wraparound packaging box 1 having an octagonal shape in a plan view, in which the top wall 30 and the bottom wall 20 have oblique sides 30a and 20a, respectively, and connecting walls 2, 3, 4, and 5 are provided, was exemplified, but this configuration is not limited. For example, the present invention can also be applied to a wrap-around type packaging box 1 that is square in plan view and in which the top wall 30 and bottom wall 20 do not have the oblique sides 30a and 20a, respectively, and the connecting walls 2, 3, 4, and 5 are not provided. [Explanation of symbols]

[0052] DESCRIPTION OF SYMBOLS 1...packaging box, 2, 3, 4, 5...connecting wall, 10...body, 11, 12...first side wall, 13, 14...second side wall, 13A, 13B, 14A, 14B...inner flap, 17...handle portion, 20...bottom wall, 20a...hypothetic side, 21, 22, 31, 32...outer flap, 30...top wall, 30a...hypothetic side, H1...first break line, H2...second break line, H3...third break line, R1...first ridge line, R2...second ridge line, R3...third ridge line, T1, T2...cutting means (cut tape)

Claims

1. a body portion having a pair of first side walls opposing each other in a first direction, a top wall connecting upper ends of the pair of first side walls, and a bottom wall connecting lower ends of the pair of first side walls; a pair of second side walls that face each other in a second direction perpendicular to the vertical direction and the first direction and close the opening of the body portion; Equipped with a first break line provided on a first ridge line of a boundary between the first side wall and the top wall located on one side in the first direction; a second break line provided on a second ridge line of a boundary between the first side wall and the bottom wall located on one side in the first direction; a third break line provided at the center in the second direction of the first side wall located on one side in the first direction and extending in a vertical direction between the first break line and the second break line; and the first side wall broken along the first break line, the second break line, and the third break line is rotatable about a third ridge line that is located at an end of the second side wall on one side in the first direction and extends in the vertical direction as a hinge portion; the first side wall located on one side in the first direction has a handle portion that forms an opening when pushed in, a portion of the opening is formed by the third break line; The contour of the third break line is a wavy curve that extends in the vertical direction and displaces back and forth in the second direction, and the third break line, which is a curve that is concave in a concave direction, is exposed at the opening of the packaging box.

2. the top wall and the bottom wall are octagonal in plan view with oblique sides at corners, and each has an outer flap that forms a part of the second side wall; The pair of first side walls each have an inner flap that is connected to both sides in the second direction via a connecting wall and forms a part of the second side wall, The connecting wall is bent along the oblique side between the first side wall and the inner flap. The packaging box according to claim 1.

3. cutting means disposed around the entire periphery including the inner surfaces of the pair of first side walls and the inner surfaces of the pair of second side walls; A portion of the cutting means is disposed on the inner surface of the handle portion. The packaging box according to claim 1 or 2.

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