JP2024058773A - Packaging boxes and blanks - Google Patents

Abstract

[Problem] To provide a packaging box and a flank that facilitate opening operations. [Solution] The top wall 12 has a pair of upper cut lines 12C on the left and right for separating the lid from the side walls, and the front wall 11 has a pair of front cut lines 11C on the left and right for separating the lid from the front wall 11. The upper cut lines 12C extend from the edge of the top wall 12 and the rear wall 13 toward the front wall. The front cut lines 11C extend from the finger hook 11N to a portion of the edge of the front wall 11 that is located above the finger hook 11N. The buffer holding plate has a folding line and is joined to the rear wall 13 and the lid so as to extend the folding in conjunction with the rise of the lid. At least one of the front wall 11 and the top wall 12 is a connecting wall, and the front cut lines 11C are connected to the upper cut lines 12C directly or via a portion of the left and right end edges of the connecting wall that is not joined to the side walls. [Selected Figure] Figure 2

Description

The present disclosure relates to packaging boxes and blanks for containing packaged items.

A paper packaging box for containing packaged goods such as eggs has, for example, a front wall, a rear wall, a bottom wall, a cover plate, a left side wall, and a right side wall. One example of the packaging box further has a pair of upper and lower buffer retaining plates. Each buffer retaining plate is positioned between the bottom wall and the cover plate so that the buffer retaining plate is parallel to the cover plate. Each buffer retaining plate has a retaining hole that penetrates in the vertical direction. The packaged goods are passed through the retaining hole of each buffer retaining plate so that the packaged goods are surrounded by each buffer retaining plate. Each buffer retaining plate absorbs external forces acting on the packaged goods from outside the packaging box (for example, see Patent Document 1).

The front wall has a pair of front wall notches at the top and bottom. Each front wall notch is positioned parallel to the buffer retaining plate and extends from one end of the front wall to the other end in the left-right direction. The portion of the front wall sandwiched between the pair of front wall notches is separated from the front wall. This allows the packaged items contained in the packaging box to be viewed from the front of the packaging box.

The lid plate has a front fold line which is the front edge of the lid plate, and a lid fold line which is located in the center of the lid plate in the front-rear direction. The packaging box is folded from the lid plate toward the front wall at the front fold line. The front fold line and the lid fold line each extend from one end of the lid plate to the other end in the left-right direction. The lid body further has a pair of lid plate notches on the left and right. The lid plate notches are located at the ends of the lid plate in the left-right direction. The lid plate notches extend from the front fold line to the lid fold line. Then, the portion of the lid plate sandwiched between the pair of lid plate notches is separated from the lid plate and lifted upward. As a result, the lid plate is folded at the lid fold line so that the lid plate is opened, and the packaged item contained in the packaging box can be removed to the outside of the packaging box.

Registered Utility Model No. 3008254

On the other hand, opening the above-mentioned packaging box requires (i) pulling the portion sandwiched between the front wall notches in the left-right direction to separate it from the front wall, and (ii) pulling the portion sandwiched between the lid plate notches upward to separate it from the lid plate and fold the lid plate at the lid fold line. The complicated operations of (i) the front wall separation operation and (ii) the lid plate separation operation carried out separately in mutually different directions make it difficult to realize the ease of opening that is originally desired for a packaging box.

A packaging box for solving the above problem includes an outer wall that divides a space in which a packaged item is stored, and a buffer retaining plate that is positioned in the space to retain the packaged item in the space, and the outer wall is configured to include a front wall, a rear wall, a lower wall, an upper wall, and a pair of side walls connected to the upper wall. The front wall and the upper wall include a lid that is continuous with the upper wall from a finger hook portion on which fingers are hooked in the front wall, and that rises from an edge between the upper wall and the rear wall when the finger hook portion is pulled up. The upper wall includes a pair of upper cut lines on the left and right for separating the lid portion from the side walls. The front wall includes a pair of front cut lines on the left and right for separating the lid portion from the front wall. The upper cut lines extend from the edge between the upper wall and the rear wall toward the front wall, and the front cut lines extend from the finger hook portion to a portion of the edge of the front wall that is located above the finger hook portion. The buffer plate has a fold line and is joined to the rear wall and the lid so that the fold of the buffer plate unfolds in conjunction with the rise of the lid. At least one of the front wall and the top wall is a connecting wall, and the front cut line is connected to the top cut line directly or through a portion of the left and right edges of the connecting wall that is not joined to the side walls.

The blank for solving the above problem is a blank for manufacturing a packaging box having an outer wall that divides a space in which a packaged article is contained, and a buffer retaining plate that is positioned in the space so as to retain the packaged article in the space. The outer wall is composed of a front wall, a rear wall, a lower wall, an upper wall, and a pair of left and right side walls. The front wall and the rear wall are connected via the upper wall, and the upper wall and the lower wall are connected via the rear wall, and the side walls are composed of a pair of left and right upper wall flaps folded from the upper wall, a pair of left and right rear wall flaps folded from the rear wall, and a pair of left and right lower wall flaps folded from the lower wall. The front wall and the upper wall are provided with a lid portion that is continuous with the upper wall from a finger hook portion on which fingers are hooked in the front wall, and that rises from the edge of the upper wall and the rear wall in the packaging box when the finger hook portion is pulled up. The upper wall is provided with a pair of left and right upper cut lines for separating the lid portion from the side walls. The front wall has a pair of front cut lines on the left and right for separating the lid from the front wall. The buffer holding plate has a folding line and is joined to the rear wall and the lid so that the folding of the buffer holding plate is unfolded in conjunction with the rising of the lid in the packaging box. At least one of the front wall and the top wall is a connecting wall, and the front cut lines are connected to the top cut lines directly or through a portion of the left and right end edges of the connecting wall that is not joined to the side walls.

According to each of the above configurations, the front cut line is cut from the finger hook portion upward by pulling the finger hook portion upward from the front wall. The upper cut line is cut up to the edge between the upper wall and the rear wall by pulling the finger hook portion further upward. The lid portion separated from the front wall and side wall rises from the edge between the upper wall and the rear wall, and opens the packaging box. This sets the opening direction of the packaging box to a single direction, like the direction of pulling the finger hook portion. The opening operation of the packaging box is continuous as a single-direction operation, from the lid portion being separated from the front wall to the lid portion being separated from the side wall. In addition, since the front cut line and the upper cut line are a pair on the left and right, whether the opening operation is performed with the right hand or the left hand, the packaging box can be easily opened.

On the other hand, as the lid rises, the buffer plate joined to the lid and rear wall is also displaced. At this time, the joined portion of the rear wall that is joined to the buffer plate is separated from the edge between the upper wall and rear wall. Therefore, the trajectory of each point located on the lid rises away from the joined portion as the lid rises. Each point located on the buffer plate is also required to move away from the joined portion as the lid rises. In this respect, the buffer plate is joined to the rear wall and the lid so that the fold of the buffer plate is straightened when the lid rises. The straightening of the fold in the buffer plate smoothly advances the movement of each point located on the buffer plate away from the joined portion. As a result, the displacement of the buffer plate linked to the rise of the lid proceeds smoothly. And the opening of the packaging box by a single-direction operation proceeds smoothly.

In the above packaging box, the front cut lines may extend from the finger hook portion to left and right end edges of the front wall.
According to the above configuration, the range of the lid portion on the front wall extends from the finger hook portion to the left and right edges of the front wall. Therefore, compared to a case in which the front cut line does not extend to the left and right edges of the front wall, the range of the front wall that can be opened by lifting the lid portion is wider. As a result, the task of removing the packaged item from the packaging box is made easier.

In the above packaging box, the left and right end edges of the front wall may be separate from the front end edges of the side walls, and the front cut line may be connected to the middle of the upper wall and the lower wall at the left and right end edges of the front wall.

According to the above configuration, the opening of the packaging box starts with cutting the front cut line and continues from the front wall to the top wall through the left and right edges of the front wall. In this way, the left and right edges of the front wall, which are separate from the front edges of the side walls, are used to open the packaging box. Therefore, the load required to open the packaging box is reduced compared to cutting the front wall from the finger hook to the top wall.

In the above packaging box, the upper score line may be located on an edge between the top wall and the side wall.
According to the above-mentioned configuration, the range of the lid portion on the upper wall extends to the entire width of the upper wall in the left-right direction. Therefore, compared to a case where the upper cut line is not located on the edge between the upper wall and the side wall, the range of the opening that can be opened in the packaging box by lifting the lid portion is wider. As a result, the task of removing the packaged item from the packaging box becomes easier.

In the above packaging box, the side walls may have a pair of upper wall flaps on the left and right sides folded from the top wall, the length of the top wall flaps in the front-to-rear direction is shorter than the length of the top wall in the front-to-rear direction, the top wall is connected to the side walls by the top wall flaps, the upper cut line is located on the edge between the top wall and the top wall flaps, and the lid may comprise the entire top wall.

According to the above configuration, the length of the top wall flap in the front-to-rear direction is shorter than the length of the top wall in the front-to-rear direction, and the top wall is connected to the side wall by the top wall flap. Therefore, the left and right end edges of the top wall have portions that are not connected to the top wall flap, i.e., portions that are not connected to the side wall. Separation of the opening portion is completed by lifting up the portions of the left and right end edges of the top wall that are separated from the side wall in advance, and cutting the top wall flap. Therefore, the load required to open the packaging box is reduced compared to cutting the top wall from the front wall to the rear wall. In addition, because the lid portion comprises the entire top wall, the range of opening that can be made in the packaging box by lifting up the lid portion is further expanded.

In the above packaging box, the front cut line may extend from the finger hook portion to the left and right end edges of the front wall, and the upper cut line may be located on the edge between the upper wall and the side wall.
In the above packaging box, the side walls are composed of a pair of upper wall flaps folded from the top wall, a pair of rear wall flaps folded from the rear wall, and a pair of lower wall flaps folded from the bottom wall, the front cut line is connected from the finger hook portion to the middle between the top wall and the bottom wall at the left and right end edges of the front wall, the length of the top wall flap in the front-to-back direction is shorter than the length of the top wall in the front-to-back direction, the top wall is connected to the side walls by the top wall flaps, the upper cut line is positioned on the edge between the top wall and the top wall flaps, the lid portion comprises the entire top wall, and the connecting wall may be the front wall and the top wall.

In the above packaging box, the buffer retaining plate includes a retaining plate that extends from the rear wall to the front wall and is parallel to the top wall, a joining plate that is joined to the top wall inside the lid, and a connecting plate that extends from the front edge of the retaining plate to the joining plate, and the retaining plate and the connecting plate may be folded along one of the folding lines, and the joining plate and the connecting plate may be folded along the other folding line.

According to the above configuration, the buffer retention plate is joined to the rear wall and the lid so that the fold straightens out when the lid rises. The straightening of the fold in the buffer retention plate smoothly advances the displacement of the buffer retention plate in conjunction with the rise of the lid.

In the above packaging box, the retaining plate is an upper retaining plate, the connecting plate is an upper front connecting plate, and the buffer retaining plate includes a lower retaining plate extending from the rear wall to the front wall and parallel to the upper wall, a lower front connecting plate extending from the lower wall to the front edge of the lower retaining plate and continuing from the lower wall, and a rear connecting plate continuing from the rear edge of the lower retaining plate to the rear edge of the upper retaining plate, the rear connecting plate being joined to the rear wall, the upper retaining plate having a circular upper retaining hole penetrating the upper retaining plate, and the lower retaining plate having a circular lower retaining hole penetrating the lower retaining plate.

According to the above configuration, the buffer holding plate includes an upper holding plate and a lower holding plate, the upper holding plate includes an upper holding hole, and the lower holding plate includes a lower holding hole, so that it is possible to hold spherical packaged items such as eggs in the space. The buffer holding plate, which is connected from the lower front connecting plate to the joining plate, is connected to the lower wall. This makes it possible to manufacture a package box that can be opened by operating in a single direction from a single blank.

In the above-mentioned packaging box, the finger hook portion may be divided in the left-right center of the front wall by an arc-shaped cutting line.
According to the above-mentioned configuration, the finger hook is divided by a cutting line in the center of the front wall in the left-right direction. Therefore, whether the right hand or the left hand is placed on the finger hook, the finger hook can be hung in the same way. In addition, the mechanical rigidity of the front wall is increased compared to when the finger hook is divided by a through hole or the like.

In the above packaging box, the front wall may have a finger insertion hole penetrating the front wall at the center in the left-right direction of the front wall, and the finger hook portion may be a tongue piece that protrudes into the finger insertion hole.

According to the above configuration, the finger hook is separated by a finger insertion hole in the center of the front wall in the left-right direction. Therefore, whether the right hand or the left hand is hung on the finger hook, the operation of hanging the finger is realized in the same way, and the operation of inserting the finger is also easy. In addition, the packaged item can be viewed from the front through the finger insertion hole.

The packaging box and blank disclosed herein can improve the ease of opening the packaging box.

FIG. 1 is a perspective view showing the front, top, and right side of a packaging box in one embodiment. FIG. 2 is a perspective view showing the packaging box together with its internal structure. FIG. 3 is a perspective view of the packaging box with the right side wall thereof cut away. FIG. 4 is a front view of the packaging box. FIG. 5 is a rear view of the packaging box. FIG. 6 is a plan view of the packaging box. FIG. 7 is a bottom view of the packaging box. FIG. 8 is a right side view of the packaging box. FIG. 9 is a left side view of the packaging box. FIG. 10 is a perspective view of the packaging box with the front wall of the packaging box opened. FIG. 11 is a perspective view of the packaging box with the top wall of the packaging box opened. FIG. 12 is a plan view showing the blank. FIG. 13 is a perspective view showing the front, top, and right side of a packaging box in a modified example. FIG. 14 is a front view of the packaging box. FIG. 15 shows the right side of the packaging box with the right wall of the packaging box cut away. FIG. 16 is a right side view of the packaging box. FIG. 17 is a plan view showing the blank.

The packaging box and blank will be described with reference to Figs.
[Packing box]
The packaging box has an outer wall. The outer wall divides a space in which the packaged article is accommodated. The packaging box is formed by cartoning a blank (see FIG. 12) punched out from a blank sheet. The packaging material constituting the blank is a box board made of fibers such as vegetable fibers and synthetic fibers glued together. The box board may contain a synthetic polymeric substance or a fibrous inorganic material. An example of the packaging material is white paperboard. The packaging material may be chipboard or colored paperboard. The white paperboard may be kraft paper, kraft stretch paper, glassine, or coated cardboard. The packaging material may be water-resistant paper, oil-resistant paper, pearl paper, or aluminum-deposited paper.

An example of a packaged item is food or drink. The packaged item may be cosmetics or beauty products, sporting goods, or various gifts. The packaged item may be spherical, polyhedral, or irregular. The packaging box may be used for transportation, promotion, display, or storage. The packaging format of the packaging box may be individual packaging in which the packaged item is individually wrapped, or collective packaging in which multiple packaged items are packaged together. The packaging format of the packaging box may be primary packaging in which the packaged item is in direct contact with the packaged item, or secondary packaging in which the packaged item is in indirect contact with the packaged item.

Hereinafter, as an example of a packaging box, a primary packaging box for transporting and displaying individual packages of eggs will be described.
1, the outer wall is composed of a front wall 11, an upper wall 12, a rear wall 13, a lower wall 14, and a pair of left and right side walls connected to the upper wall 12. The front wall 11, the upper wall 12, the rear wall 13, and the lower wall 14 each have a rectangular plate shape. The front wall 11, the upper wall 12, the rear wall 13, and the lower wall 14 define a rectangular parallelepiped space for accommodating eggs.

The direction from the front wall 11 to the rear wall 13 is the rear, and the direction from the rear wall 13 to the front wall 11 is the front, and both the front and the rear are the front-to-rear direction. The direction from the upper wall 12 to the lower wall 14 is the downward direction, and the direction from the lower wall 14 to the upper wall 12 is the upward direction, and both the upward and downward directions are the up-down direction.

As shown in FIG. 12, the blank has the front wall 11, the top wall 12, the rear wall 13, and the bottom wall 14 arranged in a row in this order. The blank sandwiches the top wall 12 between the front wall 11 and the rear wall 13, and sandwiches the back wall 13 between the top wall 12 and the bottom wall 14.

Returning to FIG. 1, the top edge 11FT of the front wall 11 is continuous with the top wall 12 and also serves as the front edge of the top wall 12. The top edge 11FT of the front wall 11 is the ridge between the front wall 11 and the top wall 12. The top edge 11FT of the front wall 11 is a slitted crease that has two cut lines 11S spaced apart. The creases are linear grooves formed by pressing the box board. Each cut line 11S makes it easier to fold the top wall 12 relative to the front wall 11.

The rear edge 12BT of the upper wall 12 is continuous with the rear wall 13 and also serves as the upper edge of the rear wall 13 (see FIG. 5). The rear edge 12BT of the upper wall 12 is the edge between the upper wall 12 and the rear wall 13. The rear edge 12BT of the upper wall 12 is a slitted ruled line having two cutting lines 12S spaced apart from each other. Each cutting line 12S makes it easier to fold the rear wall 13 relative to the upper wall 12.

The bottom edge 13BB of the rear wall 13 is continuous with the bottom wall 14 and also serves as the rear edge of the bottom wall 14 (see FIG. 7). The bottom edge 13BB of the rear wall 13 is the edge between the rear wall 13 and the bottom wall 14. The bottom edge 13BB of the rear wall 13 is a slitted ruled line having two cutting lines 13S spaced apart. Each cutting line 13S makes it easier to fold the bottom wall 14 relative to the rear wall 13.

The front edge 14FB of the lower wall 14 is continuous with the lower front connecting plate 21EB (see FIG. 3) and also serves as the lower edge of the lower front connecting plate 21EB. The front edge 14FB of the lower wall 14 is the edge between the lower wall 14 and the lower front connecting plate 21EB. The front edge 14FB of the lower wall 14 is a slitted ruled line having two cutting lines 14S spaced apart (see FIG. 7). Each cutting line 14S makes it easier to fold the lower front connecting plate 21EB relative to the lower wall 14.

[Side wall]
As shown in Fig. 1, a pair of left and right side walls are composed of multiple flaps. Each side wall is formed by joining multiple flaps. Each side wall opens a part of the side of the packaging box so that the packaged article can be viewed from outside the packaging box. The direction from the right side wall to the left side wall is the left side, and the direction from the left side wall to the right side wall is the right side, and both the right side and the left side are the left-right direction.

As shown in FIG. 12, the upper wall 12 has a pair of upper wall flaps 12FR, 12FL on the left and right. The rear wall 13 has a pair of rear wall flaps 13FR, 13FL on the left and right. The lower wall 14 has a pair of lower wall flaps 14FR, 14FL on the left and right. The right side wall is composed of a right upper wall flap 12FR, a right rear wall flap 13FR, and a right lower wall flap 14FR. The left side wall is composed of a left upper wall flap 12FL, a left rear wall flap 13FL, and a left lower wall flap 14FL.

Returning to FIG. 1, the upper wall flaps 12FR, 12FL have a plate shape extending in the front-rear direction. They are bent from the upper wall 12 at the left and right end edges 12R, 12L (see FIGS. 4 and 5) of the upper wall 12. The upper wall flaps 12FR, 12FL have notches at the front ends at the left and right end edges 12R, 12L of the upper wall 12. The notches 12FK of the upper wall flaps 12FR, 12FL have a shape that tapers toward the rear. The length of the upper wall flaps 12FR, 12FL in the front-rear direction is approximately equal to the length of the upper wall 12 in the front-rear direction. The length of the upper wall flaps 12FR, 12FL in the vertical direction is approximately 1/3 of the length of the front wall 11 in the vertical direction.

The rear wall flaps 13FR, 13FL have a plate shape extending in the vertical direction. The rear wall flaps 13FR, 13FL are folded at the left and right end edges 13R, 13L (see Figures 6 and 7) of the rear wall 13. The length of the rear wall flaps 13FR, 13FL in the vertical direction is approximately equal to the length of the rear wall 13 in the vertical direction. The length of the rear wall flaps 13FR, 13FL in the front-rear direction is approximately half the length of the upper wall 12 in the front-rear direction.

The lower wall flaps 14FR, 14FL have a rectangular plate shape extending in the front-rear direction. The lower wall flaps 14FR, 14FL are folded at the left and right end edges 14R, 14L (see FIG. 4) of the lower wall 14. The length of the lower wall flaps 14FR, 14FL in the front-rear direction is approximately equal to the length of the lower wall 14 in the front-rear direction. The length of the lower wall flaps 14FR, 14FL in the up-down direction is approximately 1/3 of the length of the front wall 11 in the up-down direction.

The upper wall flaps 12FR, 12FL and the lower wall flaps 14FR, 14FL are disposed inside the rear wall flaps 13FR, 13FL (see Figures 8 and 9). The upper wall flaps 12FR, 12FL and the lower wall flaps 14FR, 14FL are joined to the rear wall flaps 13FR, 13FL. The joining material may be an adhesive or a tape material.

[Buffer holding plate]
As shown in Fig. 2, the packaging box includes a buffer holding plate in a space defined by an outer wall. The buffer holding plate holds a packaged item in the space defined by the outer wall. The buffer holding plate includes a folding line and is folded in the space defined by the outer wall. The folding line is a ruled line that guides the folding of the buffer holding plate. The buffer holding plate is composed of a lower front connecting plate 21EB, a lower holding plate 25E, a rear connecting plate 23E, an upper holding plate 26E, an upper front connecting plate 21ET, and a joining plate 22E. The lower front connecting plate 21EB, the lower holding plate 25E, the rear connecting plate 23E, the upper holding plate 26E, the upper front connecting plate 21ET, and the joining plate 22E each have a rectangular plate shape. The lower front connecting plate 21EB, the lower holding plate 25E, the rear connecting plate 23E, the upper holding plate 26E, the upper front connecting plate 21ET, and the joining plate 22E are each covered by a pair of side walls on the left and right.

As shown in FIG. 12, the blank is arranged in a row in the following order: lower front connecting plate 21EB, lower holding plate 25E, rear connecting plate 23E, upper holding plate 26E, upper front connecting plate 21ET, and joining plate 22E. The blank connects lower front connecting plate 21EB to front end edge 14FB of lower wall 14. The blank sandwiches lower holding plate 25E between lower front connecting plate 21EB and rear connecting plate 23E, and sandwiches upper holding plate 26E between upper front connecting plate 21ET and joining plate 22E.

As shown in FIG. 3, the lower front connecting plate 21EB is bent from the lower wall 14 along the front wall 11 at the front end edge 14FB of the lower wall 14. The lower front connecting plate 21EB extends from the lower wall 14 to the front end edge of the lower holding plate 25E. The lower front connecting plate 21EB is bent from the lower holding plate 25E at the front end edge of the lower holding plate 25E. The length of the lower front connecting plate 21EB in the vertical direction is about 1/4 of the length of the front wall 11 in the vertical direction. The lower front connecting plate 21EB is disposed below the finger hook portion 11N of the front wall 11. The lower front connecting plate 21EB is joined to the front wall 11. The joining material may be an adhesive or a tape material.

The lower retaining plate 25E is bent along the upper wall 12 at the lower edge of the rear connecting plate 23E. The lower retaining plate 25E extends from the rear wall 13 to the front wall 11. The lower retaining plate 25E is arranged parallel to the upper wall 12. The lower retaining plate 25E has a circular lower retaining hole 25H that penetrates the lower retaining plate 25E in the vertical direction. The lower retaining hole 25H is large enough to fit the lower part of an egg. The lower retaining plate 25E is separated from the lower wall 14 by the vertical length of the lower front connecting plate 21EB. The vertical length between the lower retaining plate 25E and the lower wall 14 is large enough that an egg fitted into the lower retaining hole 25H is separated from the lower wall 14 or comes into contact with the lower wall 14. The eggs placed in the lower holding holes 25H are cushioned by the lower holding plate 25E against stress applied from the front-to-back and left-to-right directions of the packaging box.

The rear connecting plate 23E is bent from the lower holding plate 25E at the rear end edge of the lower holding plate 25E along the rear wall 13. The rear connecting plate 23E extends from the rear end edge of the lower holding plate 25E to the rear end edge of the upper holding plate 26E. The rear connecting plate 23E is bent from the upper holding plate 26E at the rear end edge of the upper holding plate 26E along the rear wall 13. The length of the rear connecting plate 23E in the vertical direction is about half the length of the front wall 11 in the vertical direction. The rear connecting plate 23E is disposed so as to face the finger hook portion 11N of the front wall 11 in the front-rear direction. The rear connecting plate 23E is joined to the rear wall 13. The joining material may be an adhesive or a tape material.

The upper holding plate 26E is bent along the upper wall 12 at the lower edge of the upper front connecting plate 21ET. The upper holding plate 26E extends from the front wall 11 to the rear wall 13. The upper holding plate 26E is arranged parallel to the upper wall 12. The upper holding plate 26E has a circular upper holding hole 26H that penetrates the upper holding plate 26E in the vertical direction. The upper holding hole 26H is large enough to fit the upper part of an egg. The upper holding plate 26E is separated from the upper wall 12 by the vertical length of the upper front connecting plate 21ET. The vertical length between the upper holding plate 26E and the upper wall 12 is large enough that an egg fitted into the upper holding hole 26H is separated from the upper wall 12 or comes into contact with the upper wall 12. When an egg is placed in the upper retaining hole 26H, the upper retaining plate 26E absorbs the stress applied to the packing box from the front-to-back and left-to-right directions.

The upper front connecting plate 21ET is bent from the upper holding plate 26E along the front wall 11 at the front edge of the upper holding plate 26E. The upper front connecting plate 21ET extends from the upper holding plate 26E to the front edge of the joining plate 22E. The upper front connecting plate 21ET is bent from the joining plate 22E at the front edge of the joining plate 22E. The length of the upper front connecting plate 21ET in the vertical direction is about 1/4 of the length of the front wall 11 in the vertical direction. The upper front connecting plate 21ET is positioned above the finger hook portion 11N of the front wall 11. The upper front connecting plate 21ET is positioned above the front cut line 11C of the front wall 11. The upper front connecting plate 21ET is not joined to the front wall 11.

The joining plate 22E is bent from the upper front connecting plate 21ET along the upper wall 12 at the upper end edge of the upper front connecting plate 21ET. The joining plate 22E is joined to the upper wall 12. The joining material may be an adhesive or a tape material.

[Front wall 11]
4, the front wall 11 has one finger hook 11N. The finger hook 11N is disposed in the center of the front wall 11 in the left-right direction. The finger hook 11N is divided into the front wall 11 by a cutting line 11P. The cutting line 11P is a slit that penetrates the front wall 11 and has a downwardly convex arc shape. The cutting line 11P may have a semicircular arc shape, a semi-elliptical arc shape, or a broken line shape.

As shown by the two-dot chain line in Figure 4, finger hook portion 11N is separated from front wall 11 by fold line 11V that connects both ends of cutting line 11P. Fold line 11V is a ruled line that guides a mountain fold along fold line 11V into front wall 11. When a user's finger is inserted into finger hook portion 11N, finger hook portion 11N is folded toward the inside of the packaging box at fold line 11V. This allows the user's finger to be hooked on finger hook portion 11N.

The front wall 11 has a pair of front cut lines 11C on the left and right. The pair of front cut lines 11C on the left and right extend from the finger hook portion 11N to the edge of the front wall 11. An example of the edge of the front wall 11 to which the front cut lines 11C extend is the left and right end edges 11R, 11L of the front wall 11. The left and right end edges 11R, 11L of the front wall 11 are separate from the front end edges of the upper wall flaps 12FR, 12FL and the front end edges of the lower wall flaps 14FR, 14FL, i.e., the front end edges of the side walls. The front cut lines 11C extend to a position halfway between the upper wall 12 and the lower wall 14 at the left and right end edges 11R, 11L of the front wall 11. The front cut lines 11C extend to a position above the finger hook portion 11N on the edge of the front wall 11. The pair of left and right front cut lines 11C extend above the finger hook 11N in the vertical direction, and on both the left and right sides of the finger hook 11N. The front cut lines 11C do not extend to the buffer retaining plate in the front wall 11. In other words, the front cut lines 11C extend below the upper front connecting plate 21ET and above the lower front connecting plate 21EB in the vertical direction.

The front cut line 11C is a line that includes a portion where the fibers of the packaging material have been cut. The front cut line 11C may be a perforation line where slits or through holes are spaced apart in a line. The front cut line 11C may also be a half-cut line where a cut is made partway through the thickness of the packaging material.

The front cut line 11C may be spaced apart from the cutting line 11P such that the cutting of the front cut line 11C begins when the finger hook 11N is pulled up. The front cut line 11C may be connected to the cutting line 11P. The front cut line 11C may be spaced apart from the edge of the front wall 11 such that the cutting of the front cut line 11C reaches the edge of the front wall 11 when the finger hook 11N is pulled up. The front cut line 11C may be connected to the edge of the front wall 11.

As shown by the dashed line in Figure 4, the cutting line 11P and the front cut line 11C separate a downward triangular portion of the front wall 11. The area enclosed by the dashed line, cutting line 11P, and front cut line 11C in Figure 4 is the portion of the front wall 11 that is sandwiched between the front cut lines 11C, and has a functional integrity that allows that portion to be separated from the front wall 11 by pulling up the finger hook portion 11N.

The area of the front wall 11 that is located above the finger hook portion 11N and is surrounded by the edge of the front wall 11 and the pair of front cut lines 11C constitutes the lid portion. The pair of front cut lines 11C are planned cutting lines for separating the lid portion from the front wall 11. Note that while FIG. 4 shows an example in which the front cut lines 11C are straight, the front cut lines 11C may be broken or curved.

[Upper wall 12]
6, the top wall 12 has a pair of upper cut lines 12C on the left and right. The pair of upper cut lines 12C on the left and right extend from a rear end edge 12BT of the top wall 12, which is an edge between the top wall 12 and the rear wall 13, toward the front wall 11. The upper cut lines 12C are disposed on the left and right end edges 12R, 12L of the top wall 12, which are edges between the top wall 12 and a side wall, i.e., edges between the top wall 12 and the top wall flaps 12FR, 12FL.

The upper cut line 12C is a line that includes a portion where the fibers of the packaging material have been cut. The upper cut line 12C may be a perforation line where slits or through holes are spaced apart. The upper cut line 12C may also be a half-cut line where a cut is made partway through the thickness of the packaging material.

The upper cut line 12C may be disposed over the entire portion of the left and right end edges 12R, 12L of the upper wall 12 that are connected to the upper wall flaps 12FR, 12FL. A distance may be provided between the upper cut line 12C and the rear end edge 12BT of the upper wall 12 such that the upper cut line 12C is cut to reach the rear end edge 12BT when the upper wall 12 is pulled up from the front. The upper cut line 12C may be connected to the rear end edge 12BT of the upper wall 12.

The upper cut line 12C may be spaced apart from the upper edge 11FT of the front wall 11 so that the cutting of the upper cut line 12C begins when the finger hook portion 11N is pulled up. As described above, the upper wall flaps 12FR, 12FL have notches 12FK at the front ends of the left and right edges 12R, 12L of the upper wall 12. That is, the left and right edges 12R, 12L of the upper wall 12 have portions that are not joined to the side walls by the notches 12FK of the upper wall flaps 12FR, 12FL. In this way, the upper cut line 12C may be connected to the upper edge 11FT of the front wall 11 via the portions of the left and right edges 12R, 12L of the upper wall 12 that are not joined to the side walls.

The area of the upper wall 12 that is connected to the front wall 11 and is sandwiched between the pair of upper cut lines 12C constitutes the lid. That is, the lid is continuous from the finger hook 11N of the front wall 11 to the upper wall 12, comprises the entire upper wall 12, and is configured to be rotatable around the edge between the upper wall 12 and the rear wall 13. The pair of upper cut lines 12C are intended cutting lines for separating the lid from the side walls. Note that while FIG. 6 shows an example in which the upper cut lines 12C are straight, the upper cut lines 12C may be broken or curved.

The front wall 11 and the upper wall 12 form a connecting wall. The connecting wall is a wall having left and right end edges. A portion of the left and right end edges of the connecting wall connects the upper cut line 12C to the front cut line 11C and is not connected to the side wall. The front cut line 11C may be connected to the left and right end edges of the connecting wall by one end of the front cut line 11C being disposed on the left and right end edges of the connecting wall. The front cut line 11C may be connected to the left and right end edges of the connecting wall by one end of the front cut line 11C being close to the left and right end edges of the connecting wall so that the cutting of the front cut line 11C reaches the left and right end edges of the connecting wall from the finger hook portion 11N. The upper cut line 12C may be connected to the left and right end edges of the connecting wall by one end of the upper cut line 12C being disposed on the left and right end edges of the connecting wall. The upper cut line 12C may connect to the left and right edges of the connecting wall such that one end of the upper cut line 12C is close to the left and right edges of the connecting wall so that the cutting of the upper cut line 12C starts from the left and right edges of the connecting wall, or so that the cutting of the upper cut line 12C reaches the left and right edges of the connecting wall.

In other words, the connecting wall has left and right end edges that are not connected to the side walls, and is a wall that is connected to the side walls even after the front wall 11 is cut at the front cut line 11C, until the top wall 12 is cut at the top cut line 12C.

[Action]
As shown in Fig. 10, when the packaging box is opened, the user inserts his/her finger into the finger hook 11N, which is then pulled upward. A portion of the lid portion sandwiched between the front cut lines 11C in the front wall 11 begins to be cut off from the front wall 11 as the finger hook 11N is pulled up. As the finger hook 11N is pulled up, the cut by the front cut lines 11C reaches the left and right edges 11R, 11L of the front wall 11. Then, the portion of the lid portion sandwiched between the front cut lines 11C begins to rotate about the upper edge 11FT of the front wall 11 and rise up, moving away from the upper front connecting plate 21ET in the front upward direction.

As shown in FIG. 11, as finger hook portion 11N is further pulled up, the stress pulling finger hook portion 11N acts as a force that pulls up top wall 12 further from the top edge 11FT of front wall 11. The remaining part of the lid portion sandwiched between upper cut line 12C in top wall 12 begins to be detached from the side wall by the pulling up of finger hook portion 11N. The detachment of top wall 12 by the pulling up of finger hook portion 11N then reaches rear edge 12BT of top wall 12, and raises up the remaining part of the lid portion sandwiched between upper cut line 12C.

During this time, the buffer holding plate extends its fold in conjunction with the rising of the lid portion. That is, the upper front connecting plate 21ET rotates toward the upper wall 12 around the fold line that is the boundary between the upper front connecting plate 21ET and the joining plate 22E. The upper holding plate 26E approaches the upper wall 12 so as to extend the fold of the upper front connecting plate 21ET and the upper holding plate 26E. As a result, the lid portion including the entire upper wall 12 rises from the rear end edge 12BT of the upper wall 12, and both the upper front connecting plate 21ET and the upper holding plate 26E rise along the upper wall 12. The upper part of the front wall 11 and the entire upper wall 12 of the packaging box are then opened.

As described above, according to the above embodiment, the following effects can be obtained.
(1) The opening direction of the packaging box is set to a single direction, such as the direction in which the finger hook 11N is pulled up. The opening operation of the packaging box is continuous as a single-direction operation, such as from the separation of the lid part from the front wall 11 to the separation of the lid part from the side wall.

(2) Both the front cut line 11C and the upper cut line 12C form a pair on the left and right, making it easy to open the packaging box whether the opening operation is performed with the right hand or the left hand.

(3) The portion of the rear wall 13 to be joined to the rear connecting plate 23E is farther away from the edge between the upper wall 12 and the rear wall 13. For this reason, the trajectory of each point located on the upper wall 12 moves away from the portion to be joined as the lid portion rises. In addition, each point located on the upper front connecting plate 21ET and the upper retaining plate 26E is also required to move away from the portion to be joined as the lid portion rises.

In this regard, the buffer holding plate is joined to the rear wall 13 and the lid so that the bends of the upper front connecting plate 21ET and the upper holding plate 26E are straightened when the lid rises. The straightening of the bends in the buffer holding plate smoothly advances the points located on the upper front connecting plate 21ET and the upper holding plate 26E to move away from the joined portions. As a result, the displacement of the buffer holding plate linked to the rise of the lid advances smoothly. This allows the packaging box to be opened smoothly by operating in a single direction.

(4) The range of the lid portion on the front wall 11 extends from the finger hook portion 11N to the left and right end edges 11R, 11L of the front wall 11. Therefore, compared to a case in which the front cut line 11C does not extend to the left and right end edges 11R, 11L of the front wall 11, the range that can be opened by lifting the lid portion is wider. As a result, the task of removing packaged items from the packaging box is made easier.

(5) Opening of the packaging box, which begins with cutting the front cut line 11C, continues from the front wall 11 to the top wall 12 via the left and right end edges 11R, 11L of the front wall 11. In this way, the left and right end edges 11R, 11L of the front wall 11, which are separate from the front end edges of the side walls, are used to open the packaging box. Therefore, the load required to open the packaging box is reduced compared to when cutting the front wall 11 from the finger hook portion 11N to the top wall 12.

(6) The range of the lid portion on the upper wall 12 extends to the entire width of the upper wall 12 in the left-right direction. Therefore, the range of the opening that can be made in the packaging box by lifting the lid portion is wider than when the upper cut line 12C is not positioned on the edge between the upper wall 12 and the side wall. As a result, it becomes easier to remove packaged items from the packaging box.

(7) The buffer holding plate includes an upper holding plate 26E and a lower holding plate 25E, with the upper holding plate 26E having an upper holding hole 26H and the lower holding plate 25E having a lower holding hole 25H. This makes it possible to hold spherical packaged items such as eggs in the space. In addition, the buffer holding plate that extends from the lower front connecting plate 21EB to the joining plate 22E is connected to the lower wall 14, so that a package box that can be opened by operating in a single direction can be manufactured from a single blank.

(8) The finger hook portion 11N is divided by a cutting line 11P in the center of the front wall 11 in the left-right direction. Therefore, whether the right hand or the left hand is placed on the finger hook portion 11N, the finger hooking operation can be achieved in the same way. In addition, the mechanical rigidity of the front wall 11 is increased compared to when the finger hook portion 11N is divided by a through hole or the like.

[Example of change]
The above embodiment can be modified as follows.
[Finger hook 11N]
13, the front wall 11 may have a finger insertion hole 11H penetrating the front wall 11 at the center in the left-right direction of the front wall 11. In this case, the finger hook 11N may be a tongue piece that protrudes into the finger insertion hole 11H.

According to this modification, the finger hook 11N is separated by the finger insertion hole 11H in the center in the left-right direction of the front wall 11. Therefore, whether the right hand or the left hand is hooked on the finger hook 11N, the operation of hooking the finger is realized in the same way, and the operation of inserting the finger is also easy. In addition, the packaged item can be viewed from the front through the finger insertion hole 11H.

The area surrounded by the dashed line, cutting line 11P, and front cut line 11C in Figure 14 is the portion of the front wall 11 that is sandwiched between the front cut line 11C, and has a functional integrity that allows that portion to be separated from the front wall 11 by pulling up the finger hook portion 11N.

[Side wall]
The pair of left and right side walls may be composed of upper wall flaps 12FR, 12FL and rear wall flaps 13FR, 13FL.

The right side wall of the packaging box may have a rectangular plate shape that is bent from the upper wall 12 at the right end edge 12R of the upper wall 12 so as to cover the entire right side surface of the packaging box. The rectangular plate-shaped right side wall may be joined to the rear wall 13 via a flap, or may be joined to the lower wall 14 via a flap.

The left side wall of the packaging box may have a rectangular plate shape that is bent from the upper wall 12 at the left edge 12L of the upper wall 12 so as to cover the entire left side surface of the packaging box. The rectangular plate-shaped left side wall may be joined to the rear wall 13 via a flap, or may be joined to the lower wall 14 via a flap.

- As shown in FIG. 13, the length of the upper wall flaps 12FR, 12FL in the front-to-rear direction may be shorter than the length of the upper wall 12 in the front-to-rear direction. The length of the lower wall flaps 14FR, 14FL in the front-to-rear direction may be shorter than the length of the lower wall 14 in the front-to-rear direction.

Even in this configuration, the top wall 12 is connected to the side walls by the top wall flaps 12FR, 12FL. The upper cut line 12C is located on the edge between the top wall 12 and the top wall flaps 12FR, 12FL, and the lid portion comprises the entire top wall 12. The length in the front-to-rear direction of at least one of the pair of left and right side walls may be shorter than the length of the top wall 12 in the front-to-rear direction. This allows the length of the left and right end edges 12R, 12L of the top wall 12 that are not connected to the side walls to be longer by the amount that the length of the top wall flaps 12FR, 12FL is shorter. In turn, the load required to open the lid portion can be reduced by the amount that the length of the upper cut line 12C is shorter.

As shown in FIGS. 15 and 16, the length of the upper wall flaps 12FR, 12FL in the front-rear direction may be shorter than the length of the lower wall flaps 14FR, 14FL in the front-rear direction.
With this configuration, it is possible to stabilize the posture of the packaging box while reducing the load required to open the lid portion, since the length of the lower wall flaps 14FR, 14FL is longer than the length of the upper wall flaps 12FR, 12FL.

[Front cut line 11C]
The pair of left and right front cut lines 11C may extend from the finger hook portion 11N to the upper edge 11FT of the front wall 11, or may extend to the upper corner 11E of the front wall 11. The pair of left and right front cut lines 11C may extend to the upper edge 11FT of the front wall 11 via a portion of the left and right edges 11R, 11L of the front wall 11 that is not joined to the side walls. Note that when the front cut lines 11C extend to the upper edge 11FT via a portion that is not joined to the side walls, the portion that is not joined to the side walls may be directly connected to the upper edge 11FT, or the front cut lines 11C may be directly connected to the upper edge 11FT.

- When the front cut line 11C extends from the finger hook portion 11N to the top edge 11FT of the front wall 11, the top cut line 12C that is directly connected to the front cut line 11C may also extend to the top edge 11FT of the front wall 11. Alternatively, the ends of the left and right edges 12R, 12L of the top wall 12 that are not joined to the side walls and that are directly connected to the front cut line 11C may also extend to the top edge 11FT of the front wall 11. In this case, the front wall 11 is not a connecting wall. Only the top wall 12 is a connecting wall.

- When the front cut line 11C extends from the finger hook 11N to the upper corner 11E of the front wall 11, the upper cut line 12C that is directly connected to the front cut line 11C may also extend to the upper corner 11E of the front wall 11. Alternatively, the ends of the left and right end edges 12R, 12L of the upper wall 12 that are not joined to the side walls and that are directly connected to the front cut line 11C may also extend to the upper corner 11E of the front wall 11. In this case, the front wall 11 is not a connecting wall. Only the upper wall 12 is a connecting wall.

- The front cut line 11C may extend from the finger hook portion 11N to the upper edge 11FT of the front wall 11, passing through the left and right edges 11R, 11L of the front wall 11 that are not joined to the side walls. In this case, the front wall 11 constitutes a connecting wall. The upper wall 12 may or may not constitute a connecting wall.

[Upper cut line 12C]
The pair of upper cut lines 12C on the left and right may be disposed over the entire upper wall 12 in the front-rear direction from the rear end edge 12BT of the upper wall 12 to the upper end edge 11FT of the front wall 11. In this case, the upper wall 12 is not a connecting wall.

The pair of upper cut lines 12C on the left and right sides may extend to the upper edge 11FT of the front wall 11 or to the rear edge 12BT of the upper wall 12 via portions of the left and right edges 12R, 12L of the upper wall 12 that are not joined to the side walls. Extending to the upper edge 11FT via portions that are not joined to the side walls may mean that the portions that are not joined to the side walls are directly connected to the upper edge 11FT, or that the upper cut lines 12C are directly connected to the upper edge 11FT. Extending to the rear edge 12BT via portions that are not joined to the side walls may mean that the portions that are not joined to the side walls are directly connected to the rear edge 12BT, or that the upper cut lines 12C are directly connected to the rear edge 12BT.

- When the upper cut line 12C extends to the upper edge 11FT of the front wall 11, the front cut line 11C that is directly connected to the upper cut line 12C may also extend to the upper edge 11FT of the front wall 11. In this case, the upper wall 12 is not a connecting wall. The front wall 11 may or may not constitute a connecting wall.

- The upper cut line 12C may extend from midway along the rear edge 12BT of the upper wall 12, through portions of the left and right edges 12R, 12L of the upper wall 12 that are not joined to the side walls, to the upper edge 11FT of the front wall 11. In this case as well, the upper cut line 12C and the front cut line 11C may be directly connected at the upper edge 11FT. In this case, the upper wall 12 constitutes a connecting wall. The front wall 11 may or may not constitute a connecting wall.

[Upper wall 12]
13 and 17, the upper wall 12 of the packaging box and the blank may have an upper wall hole 12H that penetrates the upper wall 12 in the vertical direction. The upper wall hole 12H may be smaller than the lower retaining hole 25H or the upper retaining hole 26H. According to this modification, the packaged article can be visually confirmed from above the packaging box.

11...Front wall 11C...Front cut line 11FT...Upper edge 11N...Finger hook 11P, 11S, 12S, 13S, 14S...Cutting line 11R, 11L, 12R, 12L, 13R, 13L, 14R, 14L...Left and right edges 11V...Bending line 12...Top wall 12BT...Rear edge 12C...Top cut line 12FR, 12FL...Top wall flap 13...Rear wall 13BB...Lower edge 13FR, 13FL...Rear wall flap 14...Bottom wall 14FB...Front edge 14FR, 14FL...Bottom wall flap 21EB...Lower front connecting plate 21ET...Upper front connecting plate 22E...Joint plate 23E...Rear connecting plate 25E...Lower retaining plate 25H...Lower holding hole 26E...Upper holding plate 26H...Upper holding hole

Claims (12)

A packaging box comprising an outer wall that divides a space in which a packaged article is housed, and a buffer holding plate that is positioned in the space so as to hold the packaged article in the space, the outer wall being composed of a front wall, a rear wall, a lower wall, an upper wall, and a pair of side walls on the left and right that are connected to the upper wall,
the front wall and the upper wall each include a finger hook portion on which a finger is hooked in the front wall, the finger hook portion being continuous with the upper wall, and a lid portion rising from an edge between the upper wall and the rear wall when the finger hook portion is pulled up;
The upper wall has a pair of upper cut lines on the left and right for separating the lid portion from the side wall,
The front wall has a pair of front cut lines on the left and right for separating the lid portion from the front wall,
the upper cut line extends from a ridge between the upper wall and the rear wall toward the front wall;
The front cut line extends from the finger hook to a portion of the edge of the front wall that is located above the finger hook,
The buffer holding plate has a fold line and is joined to the rear wall and the lid portion so that the fold of the buffer holding plate is unfolded in conjunction with the rise of the lid portion;
At least one of the front wall and the upper wall is a connecting wall,
The packaging box according to claim 1, wherein the front cut line is connected to the upper cut line directly or via a portion of the left and right end edges of the connecting wall that is not joined to the side wall. The packaging box according to claim 1 , wherein the front cut lines extend from the finger hooks to left and right end edges of the front wall. The left and right end edges of the front wall are separate from the front end edges of the side walls,
The packaging box according to claim 2 , wherein the front cut lines are connected to midpoints between the upper wall and the lower wall on the left and right end sides of the front wall. The packaging box according to claim 1 , wherein the upper score line is disposed on an edge between the top wall and the side wall. The side walls include a pair of upper wall flaps folded on the left and right from the upper wall,
The length of the upper wall flap in the front-rear direction is shorter than the length of the upper wall in the front-rear direction,
the top wall is connected to the side wall by the top wall flap;
the upper score line is disposed at an edge of the upper wall and the upper wall flap;
The packaging box of claim 4 , wherein the lid portion comprises the entire top wall. The front cut lines extend from the finger hook portion to the left and right end edges of the front wall,
The packaging box according to claim 1 , wherein the upper score line is disposed on an edge between the top wall and the side wall. The side walls are composed of a pair of upper wall flaps folded from the upper wall, a pair of rear wall flaps folded from the rear wall, and a pair of lower wall flaps folded from the lower wall,
The front cut line is connected from the finger hook portion to the middle of the upper wall and the lower wall at the left and right end sides of the front wall,
The length of the upper wall flap in the front-rear direction is shorter than the length of the upper wall in the front-rear direction,
the top wall is connected to the side wall by the top wall flap;
the upper score line is disposed at an edge of the upper wall and the upper wall flap;
The lid portion comprises the entire upper wall,
The packaging box according to claim 1 , wherein the connecting walls are the front wall and the top wall. The buffer holding plate is
a retaining plate extending from the rear wall to the front wall and parallel to the top wall;
a joining plate joined to the upper wall of the lid portion;
A connecting plate extending from a front end edge of the holding plate to the joining plate,
The packaging box according to claim 1 , wherein the holding plate and the connecting plate are folded along the folding line. the retaining plate is an upper retaining plate,
The connecting plate is an upper front connecting plate,
The buffer holding plate is
a lower retaining plate extending from the rear wall to the front wall and parallel to the upper wall;
a lower front connecting plate extending from the lower wall to a front end edge of the lower holding plate and continuing from the lower wall;
A rear connecting plate extending from a rear end edge of the lower holding plate to a rear end edge of the upper holding plate,
The rear connecting plate is joined to the rear wall,
The upper holding plate includes a circular upper holding hole penetrating the upper holding plate,
The packaging box according to claim 8 , wherein the lower support plate has a circular lower support hole penetrating the lower support plate. The packaging box according to any one of claims 1 to 9, wherein the finger hook portion is divided in the left-right center of the front wall by an arc-shaped cutting line. the front wall has a finger insertion hole penetrating the front wall at a center in a left-right direction of the front wall,
The packaging box according to any one of claims 1 to 9, wherein the finger hook portion is a tongue that protrudes into the finger insertion hole. A blank for manufacturing a packaging box comprising an outer wall that defines a space in which a packaged article is housed, and a buffer retaining plate that is positioned in the space so as to retain the packaged article in the space,
The outer wall is composed of a front wall, a rear wall, a lower wall, an upper wall, and a pair of side walls on the left and right,
the front wall and the rear wall are connected via the upper wall,
the upper wall and the lower wall are connected via the rear wall,
The side walls are composed of a pair of upper wall flaps folded from the upper wall, a pair of rear wall flaps folded from the rear wall, and a pair of lower wall flaps folded from the lower wall,
The front wall and the upper wall include a finger hook portion on the front wall for hooking fingers, the finger hook portion being continuous with the upper wall, and a lid portion rising up from an edge between the upper wall and the rear wall when the finger hook portion is pulled up in the packaging box,
The upper wall has a pair of upper cut lines on the left and right for separating the lid portion from the side wall,
The front wall has a pair of front cut lines on the left and right for separating the lid portion from the front wall,
The buffer holding plate has a fold line and is joined to the rear wall and the lid portion so that the fold of the buffer holding plate is extended in conjunction with the rise of the lid portion in the packaging box;
At least one of the front wall and the upper wall is a connecting wall,
The blank, wherein the front cut line is connected to the upper cut line directly or via a portion of the left and right end edges of the connecting wall that is not joined to the side walls.

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