JP2012218742A - Fermented soybean container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fermented soybean container having a structure capable of very easily closing a lid body part after placing a fermented soybean raw material in a container body part, and opening the lid body part when eating fermented soybean.SOLUTION: Fermented soybean is placed in the fermented soybean container A. The fermented soybean container A includes a container body part 1 having a flange part 3, and a lid body part 2 having a flange part 4. The container body part 1 and the lid body part 2 are connected to each other at edges of their flange parts 3, 4 via a hinge part 5. The container body part 1 has a vertical wall 7 erected upwardly from a surface of the flange part 3 of the container body part 1 at the circumference of a recessed container part 6 of the container body part 1. The lid body part 2 has a fitting recess 8 in which the vertical wall 7 is fitted when closing the lid. The lid-closing condition is maintained by the friction force between the vertical wall 7 and the fitting recess 8.

Description

  The present invention relates to a natto container.

  A commercially available general natto container is, for example, the type shown in FIG. 7 (Japanese Patent Laid-Open Nos. 2008-265780 and 2010-241487). In FIG. 7, 51 is a container main body part, 52 is a concave container part (concave part) for storing (filling) natto in the container main body part, 53 is a flange part in the container main body part 51, 54 is a lid part, and 55 is A convex portion provided on the lid body portion 54, 56 is a flange portion in the lid body portion 54, and 57 is a hinge portion. The flange portion 53 and the flange portion 56 are connected by the hinge portion 57. In such a container, after the natto raw material is put in the concave portion 52, the lid portion 54 is closed. Then, heat sealing is performed between the flange part 53 and the flange part 56 in the remaining sides other than the hinge part 57, and it is conveyed to a fermentation chamber. That is, the conventional natto containers, as described in Japanese Patent Application Laid-Open No. 2008-265780 and Japanese Patent Application Laid-Open No. 2010-241487, basically, the flange portion of the container body portion and the flange portion of the lid body portion, It is integrally fixed by heat sealing or the like. Therefore, if the lid of the natto container of this type is to be opened, the heat seal must be broken. At this time, too much force is applied to open the lid, and the lid body portion 54 is broken. In severe cases, the container main body 51 was broken, and the natto contained (filled) in the concave container part (concave part) 52 was even dropped onto the floor.

  Therefore, if possible, it was desired to develop a natto container having a structure that does not require heat sealing. Development from such a viewpoint has been advanced, and a natto container that does not require heat sealing has been proposed.

  For example, the outer shape is square and the support means of the natto production line can be used as it is, and the internal natto can be easily stirred, and it can be held in a closed state without the need for heat sealing. For the purpose of easily closing the lid, as shown in FIG. 8, a container recess 61 for storing natto is formed with a flat rectangular flange 63 around the opening. A natto container comprising a lid 65 connected to the container main body 61 via a hinge part 64, wherein the side wall of the storage recess 62 of the container main body 61 continues downward from the opening. An upper side wall 66 extending, a step portion 67 formed by bending inwardly from the upper side wall at a height position close to the opening, and a lower side wall extending downward from the step portion 67 to the bottom portion forming a flat circular shape 68, the lower side wall A convex portion 70 is formed in the lid body 65 at a position corresponding to the opening of the housing recess 62 and fitted inside the opening when the lid is closed. Furthermore, a natto container is proposed in which a flange portion of the container body 61 and a flange portion of the lid body 65 are provided with an engagement concave portion 71 and an engagement convex portion 72 that are fitted to each other when the lid is closed (JP 2010). -202282).

  Further, as shown in FIG. 9, a container main body 81 in which a storage recess 82 for storing natto is formed around the opening leaving a flat rectangular flange 83, and a hinge portion 84 is provided on the container main body 81. A natto container comprising a flat rectangular lid 85 connected through the upper side wall 86, the side wall of the storage recess 82 of the container body 81 extending continuously downward from the opening, and an opening A step portion 87 formed by bending inward from the upper side wall at a height position close to the portion, and a lower side wall 89 extending downward from the step portion so as to be tapered and extending to the bottom portion 88 of the circular plane. The lid 85 is formed with a rib-like protrusion 90 that fits inside the opening when the lid is closed, at a position corresponding to the opening of the storage recess 82. Overhang 9 that is extended outward at one or more locations Further, in the vicinity of the two corners of the flange portion 83 of the container body 81, an engagement recess 92 is formed continuously with the opening of the storage recess 82, and the lid 85 corresponding to this is formed. In the vicinity of the corner portion of the flange portion 93, there is proposed a natto container provided with an engaging convex portion 94 that is continuous with the rib-shaped convex portion 90 and fits into the engaging concave portion 92 when the lid is closed. .

JP 2008-265780 A JP 2010-241487 A JP 2010-202282 A JP 2011-42400 A

  The natto container proposed in Japanese Patent Application Laid-Open No. 2010-202282 and Japanese Patent Application Laid-Open No. 2011-42400 employs a concave / convex fitting (engagement) structure between the container main body and the lid, thereby heat sealing. Can be rejected.

  However, the lid portion is not closed and locked with respect to the container body portion by a strong coupling force called heat sealing. Therefore, even if a relatively large force does not act, the lid body part is slightly displaced, and between the lid body part and the container body part, particularly between the upper surface of the flange part of the container body part and the lower surface of the flange part of the lid body part. In many cases, there are gaps. Insects and dusts scattered on the upper surface of the flange portion of the container main body easily enter the storage recesses 62 and 82 from the gap.

  Further, in the case of the natto container of FIG. 7 and the natto containers of FIGS. 8 and 9, when the lid is opened and the natto in the container body is to be stirred, for example, the flange part of the container body with the thumb and forefinger Is held between them. In this state, natto is stirred with chopsticks. At this time, it is happening that the natto stickiness sticks to the thumb on the upper surface of the flange portion. This is very disgusting.

  Therefore, the problem to be solved by the present invention is to solve the above problem.

  In particular, the first problem to be solved by the present invention is that the heat sealing process does not have to be actively performed between the container body and the lid, and the natto raw material is placed in the container body. It is another object of the present invention to provide a natto container having a structure that is very easy to close the lid body portion and to open the lid body portion when eating natto. Furthermore, since heat sealing is not actively performed, the lid body portion is displaced due to weak lid locking force of the lid body, and there is a slight gap between the container body portion and the lid body portion. The object is to provide a natto container having a structure in which insects and dust are difficult to enter (difficult to drop) even when a gap is formed. And when stirring natto put in the container main-body part, it is providing the natto container of the structure where the stickiness of natto does not stick to a thumb.

  The second problem to be solved by the present invention is to provide a natto container having a structure that facilitates taking out natto from the container body when eating natto.

The first problem is
A natto container into which natto can be placed,
The natto container is
A container body portion having a flange portion, and a lid portion having a flange portion,
The container body part and the lid part are connected via a hinge part at the edge of each flange part,
The container body part and the lid part are formed of a foam material,
The container body is
In the periphery of the concave container part of the container main body part, comprising a standing wall erected above the surface of the flange part of the container main body part,
The lid portion is
A fitting recess into which the standing wall is fitted when the lid is closed;
When the lid is closed with respect to the container body, the fitting recess of the lid fits into the standing wall of the container body, and the gap between the standing wall and the fitting recess This is solved by a natto container characterized in that the closed state is maintained by the frictional force.

  Said 1st and 2nd subject is said natto container, Comprising: The said standing wall comprises a high wall part with high height, and a low wall part with low height, The natto container characterized by the above-mentioned Solved by.

  The natto container is preferably solved by a natto container, wherein the standing wall includes a low wall portion at a position on the center portion side on the front end side facing the hinge portion.

  The natto container is preferably solved by a natto container, wherein the standing wall includes a high wall portion at a position on the end side on the front end side facing the hinge portion.

  In the natto container, preferably, the concave container portion is substantially rectangular in a plan view, and the standing wall includes a high wall portion at corners of the four corners of the substantially rectangular shape. Solved by natto container.

  In the natto container, preferably, the concave container part is solved by a natto container having a length of 5 to 13 cm in plan view.

  In the natto container, preferably, when a pressing force is applied to the concave container portions on the front end side and the rear end side opposed to the hinge portion, the standing wall bends and the standing wall and the fitting concave portion This is solved by a natto container, which is configured to be opened by the elastic force of the hinge part.

  In the natto container of the present invention, when the lid is closed, it is not necessary to positively take measures such as heat sealing. That is, in the natto manufacturing process, when the natto raw material (or natto) is put in and closed, conventionally, in order to give a closing force, the container body part and the lid part are heat sealed. Such processing is no longer absolute. Accordingly, the natto manufacturing process can be simplified, and the cost can be reduced.

  Since heat sealing is not positively performed between the container main body and the lid body, the lid locking force of the lid body is weak. When a force exceeding the weak closing lock force is applied, the lid body portion is displaced, and a slight gap is formed between the container main body portion and the lid body portion. However, even if such a gap is formed, it is difficult for insects and dust to enter the natto container of the present invention.

  After purchasing the product containing natto in the natto container of the present invention, the lid is opened, and the natto in the container main body is stirred and eaten with, for example, chopsticks. At this time, for example, the flange portion of the container main body is grasped by the thumb and the index finger, and the mixing is performed. At this time, the thumb is guarded by the standing wall. Therefore, it is difficult for the sticky natto made by stirring natto to stick to the fingers. In other words, if there is no standing wall, stirring the natto in the container body will often cause natto stickiness to stick to the fingers, although it may be inadvertent. This is very unpleasant, but when the container of the present invention is used, such a phenomenon hardly occurs. Usability is very good.

The perspective view in the open state of the natto container which becomes this invention Sectional drawing in the XX line in the closed state of the natto container which becomes this invention Sectional drawing in the YY line in the closed state of the natto container which becomes this invention The top view which shows the deformation | transformation condition of the standing wall at the time of making pressing force act on the container main-body part of the natto container which becomes this invention. Explanatory drawing of the state of use when stirring the natto contained in the container body of the natto container according to the present invention Use state explanatory drawing when taking out natto from the container body of the natto container according to the present invention Illustration of a conventional natto container Illustration of a conventional natto container Illustration of a conventional natto container

  The present invention is a natto container into which natto is placed. This natto container includes a container body and a lid. The container main body part and the lid body part are formed of a foam material. The natto container of the present invention is obtained, for example, by molding (molding) a foam material into a predetermined shape. For example, it can be obtained by foaming (molding) a resin into a desired shape. Both the container body part and the lid part have a flange part. Both of the outer shapes of the flange portions are substantially rectangular in plan view. For example, it is approximately square or approximately rectangular. This rectangle has a side length of, for example, about 5.5 to 14 cm. More preferably, it is 12 cm or less. The one end edge of the flange part of the said container main-body part and the one end edge of the flange part of the said cover body part are connected. A hinge mechanism (hinge portion) is provided at the connecting portion. The hinge part (hinge mechanism) is composed of, for example, two parallel V-grooves. By this hinge mechanism, the lid can be rotated. By this rotation, the lid part is opened and closed. A container main-body part comprises a concave container part (concave part). The outer shape of the concave portion is, for example, substantially rectangular in plan view. For example, it is approximately square or approximately rectangular. This rectangle has a side length of about 5 to 13 cm. More preferably, it is 10 cm or less. The depth is, for example, about 1.5 to 3 cm. The container main body portion includes a standing wall that stands above the surface of the flange portion around the concave container portion (concave portion). The standing wall exists, for example, on the extension of the inner wall of the concave portion. Of course, a step may exist between the inner wall surface of the concave portion and the inner wall surface of the standing wall. That is, the inner wall surface of the concave portion and the inner wall surface of the standing wall may not form one flat surface. However, preferably, the inner wall surface of the standing wall is present on the extension of the inner wall surface of the concave portion (the inner wall surface of the concave portion and the inner wall surface of the standing wall constitute one flat surface). This is because when natto in the concave portion is taken out, it can be taken out smoothly. The standing wall preferably includes a high wall portion (a wall portion having a high height) and a low wall portion (a wall portion having a low height). That is, when the low wall portion is provided, air can enter and exit relatively smoothly into the concave container portion (concave portion) even when the lid is closed. For this reason, it is convenient to put a natto raw material in a concave container part (concave part) and to ferment. The low wall portion is preferably configured at a position on the center portion side on the front end side (side far from the hinge portion) facing the hinge portion. And it is preferable to make a high wall part comprise in the position of the left side and / or right side of this center part. For example, it is preferable to configure the high wall portion at a position on the end portion side on the front end side facing the hinge portion. When the low wall portion is configured at such a position, when the natto is to be taken out, the low wall portion at the position comes to function as a natto discharge (take-out) guide (weir opening), and the natto is taken out. Work is smoother and more definitely done. When the concave container portion (concave portion) is substantially rectangular in plan view, it is preferable that the high wall portion is configured at the corners of the four corners of the substantially rectangular shape. And it is preferable to comprise a low wall part in the approximate center part position of each edge | side. The height of the high wall portion (standing wall) (the height from the upper surface of the flange portion) is about 5 to 15 mm. More preferably, it is about 7 to 13 mm. Here, the reason why the high wall portion is formed is to ensure the lid locking force of the lid body portion when the lid is closed, in addition to the above reason. That is, in the present invention, for example, a process such as heat welding is not basically performed on the container body and the lid. In the present invention, the lid lock of the lid body is secured (maintained) by the frictional force between the standing wall when the lid is closed and the fitting recess of the lid body described later. Therefore, it is preferable that the standing wall and the fitting recess are joined, particularly preferably in close contact (pressure contact), over a certain length (area). When this joining length is very short in the vertical direction (opening direction), the frictional resistance generated between the standing wall and the fitting recess is small. Therefore, it was preferable to configure as described above. The height of the low wall portion (standing wall) (the height from the upper surface of the flange portion) is about 0 to 10 mm. More preferably, it is about 2 to 8 mm. Furthermore, it is about 2-6 mm. In consideration of air in and out, the height of the low wall portion (height from the upper surface of the flange portion) may be 0 mm. In this case, even when the lid is closed, a gap that leads to the inside and outside of the concave container portion (concave portion) is easily formed. This makes it easier for foreign objects (dust and insects) to enter (drop). Therefore, if there is a partition wall of about 1 mm or more preferably 2 mm or more, this wall becomes a barrier. And it becomes difficult for dust and insects to enter (drop) inside. That is, it is preferable that a low wall portion (standing wall) of about 2 to 8 mm exists. The standing wall has the following functions in addition to the above functions. After purchasing a product containing natto in a natto container, the lid is opened, and the natto in the container main body is stirred and eaten with, for example, chopsticks. At this time, the flange part of the container main body part is grasped by the thumb and the index finger and the mixing is performed. At this time, the thumb is guarded by the standing wall. Therefore, it is difficult for the sticky natto made by stirring natto to stick to the fingers. In other words, if there is no standing wall, stirring the natto in the container body will often cause natto stickiness to stick to the fingers, although it may be inadvertent. By the way, if the width of the flange portion is large, such as several centimeters, the fingers will hardly protrude toward the concave container portion (concave portion) when grasped. However, the width of the flange portion is generally about 1 cm, for example. When the width of the flange portion is increased to a few cm, the material cost increases. Furthermore, for example, a large display area is required at the time of sale. A large space is required for transportation. For this reason, the width of the flange portion cannot be made sufficiently large such as several centimeters. For this reason, when the flange portion is gripped, the finger is likely to be fitted into the concave container portion (concave portion) side (easy to protrude). As a result, if there is no standing wall, if the natto in the container body is being stirred, there is a high risk that the natto stickiness will stick to the finger. This is very disgusting. However, in the present invention, such a problem is greatly improved by the action (function) exhibited by the standing wall. Usability is very good. The lid body portion includes a fitting recess into which the standing wall is fitted when the lid is closed. And when the said lid part is closed with respect to the said container main-body part, the recessed part for fitting of this cover-body part fits in the standing wall of this container main-body part, The said standing wall, this recessed part for fitting, The closed state is maintained by the frictional force between the two. The natto container is preferably a standing wall when a pressing force is applied to the concave container parts on the front end side (side far from the hinge part) and the rear end side (side close to the hinge part) facing the hinge part. Especially, the standing wall far from the hinge part bends, the frictional force between the standing wall and the recess for fitting is lowered, the closing force is loosened, and the lid is opened by the elastic force of the hinge part. It is configured. Accordingly, when the concave container portion is gripped and pressed, the lid portion is opened. This is very convenient.

  This will be described in more detail below.

  1 to 6 are for explaining an embodiment of a natto container according to the present invention, FIG. 1 is a perspective view of the natto container in an open state, and FIG. 2 is an X state in a closed state of the natto container. FIG. 3 is a cross-sectional view taken along the line Y-Y when the natto container is closed, and FIG. 4 is a deformation of the standing wall when a pressing force is applied to the container body of the natto container. Fig. 5 is a plan view showing the condition, Fig. 5 is an explanatory diagram of the state of use when stirring the natto contained in the container body of the natto container, and Fig. 6 is an explanatory diagram of the state of use when taking out natto from the container body of the natto container. It is.

  In each figure, A is a natto container. The natto container A is made of a foam material. For example, polystyrene resins such as styrene modified polyolefin resin, polystyrene, high impact polystyrene, styrene-ethylene copolymer, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer, polyethylene, polypropylene, ethylene-acetic acid It is configured using a foamed sheet made of various synthetic resins such as polyolefin resin such as vinyl copolymer and polyester resin such as polyethylene terephthalate. Of course, the material is not limited to the above resin. Here, the foam material is preferably used not only from the viewpoint of heat insulation (cooling effect) and rigidity (shape retention), but also due to the unevenness of the surface caused by foaming, the lid is closed and locked. This is because a force (a frictional resistance force when the lid is closed (resistance force against the lid)) is easily secured. And the thermosetting process, such as vacuum forming, was performed with respect to the above foamed resin sheets, and the natto container A was comprised.

  The natto container A has a container body 1 and a lid 2. The container body 1 has a flange 3. The lid part 2 also has a flange part 4. These flange portions 3 and 4 are substantially square having an outer shape of about 9.5 cm on a side. The thickness is about 2-3 mm. The flange portion 3 having an approximately square outer shape and the flange portion 4 having an approximately square outer shape are connected on one side. Two V-shaped grooves 5 are formed in the connecting portion. That is, a hinge mechanism (hinge part) is constituted by the two V-shaped grooves 5. This exerts a rotation axis function when the lid 2 is opened and closed. And here, there is some resilience function. Therefore, when the lid locking force of the lid portion 2 is released, the lid portion 2 opens semi-automatically by the elastic function.

  The container main body 1 has a concave portion (concave container portion) 6 into which natto material is placed. The concave portion 6 is a substantially rectangular shape (substantially square) having a side length of about 8 cm in plan view. The depth (depth from the lower surface of the flange portion 3) is about 2 cm. The concave portion 6 has a small area on the bottom side (lower side) and a large area on the opening side (upper side). That is, the concave portion 6 has a shape in which the inner wall surface is inclined in a tapered shape. Although not shown, the outer wall surface of the concave portion 6 is provided with an appropriate rib structure in the horizontal direction. Further, an appropriate rib structure is also provided on the bottom surface (upper surface and lower surface) of the concave portion 6. That is, the strength is ensured by these rib structures.

  The container main body 1 further has a standing wall 7. The standing wall 7 has one end connected to the inner end of the flange portion 3 and the other end connected to the upper end of the recessed portion 6. Accordingly, the standing wall 7 has a bowl shape in cross section. The standing wall 7 having a bowl-shaped cross section can be understood from the fact that the other end side is connected to the upper end portion of the concave portion 6, but the inner wall surface of the standing wall 7 and the inner wall surface of the concave portion 6 have one flat slope. The surface is configured. The standing wall 7 is provided along the periphery of the concave portion 6. Therefore, the standing wall 7 has a ring shape having a substantially rectangular shape (substantially square) in plan view. And the said standing wall comes to have a rib effect.

  The standing wall 7 has a height in the height direction. That is, it has the high wall part 7a with a high height, and the low wall part 7b with a low height. The high wall portion 7a exists at the corners of the four corners. The low wall portion 7b exists at a substantially central portion of each side of the rectangle. The high wall portion 7a and the low wall portion 7b may change at the boundary like a precipice or may change gradually (gradually). In this embodiment, as can be seen from FIG.

  The lid body portion 2 has a concave portion 8 in which the outer wall surface of the standing wall 7 is in close contact with the lid. The flange portion 4 is connected to the outside of the concave portion 8.

  As can be seen from FIGS. 1, 2, and 3, the natto container configured as described above is in close contact with the outer wall surface of the standing wall 7 and the inner wall surface of the recess 8. Then, the frictional resistance acting between the outer wall surface of the standing wall 7 and the inner wall surface of the recess 8 becomes the elastic repellent lid force of the hinge mechanism portion formed by the two V-shaped grooves 5. I'm winning. Therefore, even if heat sealing (thermal welding) is not performed between the flange portion 3 and the flange portion 4, the lid is locked. Of course, there is a gap between the container main body 1 and the lid body 2 (between the upper surface of the flange portion 3 and the lower surface of the flange portion 4) because it is not an adhesive force such as heat sealing (thermal welding). May. However, even if a gap is formed, since the standing wall 7 is provided along the periphery of the concave portion 6 on the upper surface of the flange portion 3, dust, insects, etc. enter the concave portion 6 (drop off). )hard.

  When the lid 2 is closed, the high wall 7 a is in contact with the top surface of the lid 2. However, the low wall portion 7 b is not in contact with the top surface of the lid body portion 2. Therefore, even when the lid 2 is closed, there is a gap at the low wall portion 7b. This means that air can easily enter and exit the concave portion 6. Therefore, when the natto raw material is put into the concave portion 6 of the container main body 1 and is transported to the fermentation chamber after the lid is closed and the fermentation process is performed, the fermentation proceeds well.

  Fermentation proceeds, and this is delivered to a store for sale. As shown in FIG. 4, the customer who purchased the natto contained in this container has the opposite outer wall surface of the concave portion 6, in particular, the opposite side surface parallel to the V-shaped groove 5 with the thumb and index finger (middle finger). , And apply a pressing force. Then, the standing wall 7, particularly the high wall portion 7 a existing on the front end side (a line parallel to the V-shaped groove 5 and a line far from the V-shaped groove 5) bends inward. Of course, the low wall portion 7b to which force is applied is greatly bent inward. For this reason, since a gap is formed between the outer wall surface of the standing wall 7 and the inner wall surface of the recess 8, the frictional resistance force between them is reduced. As a result, the elastic repellent lid force of the hinge portion becomes greater than the frictional resistance force, and the lid portion 2 opens. That is, the lid can be opened simply by pressing the wall surface of the concave portion 6 with one hand. This is very convenient.

  After opening, the flange portion 3 of the container body 1 is held as shown in FIG. Then, the natto in the concave portion 6 is stirred with chopsticks or the like. At this time, even if natto is scattered, the finger on the upper surface of the flange portion 3 is guarded by the standing wall 7. For example, the thumb is pressed against the standing wall 7, and the lower side of the thumb is hidden by the standing wall 7. And it is prevented reliably that a finger fits into (intrudes into) the concave portion 6. Therefore, it is prevented that the natto stickiness sticks to the finger.

  When the natto is stirred, the container is tilted and the natto is carried on the rice as shown in FIG. At this time, the low wall portion 7b functions as a natto take-out guide (dam opening portion). And natto is successfully carried on the rice.

  In the above, exemplary embodiments of the present invention have been described. The natto container of the above embodiment is basically not heat sealed. However, in order to escape the present invention, it should be considered that it is substantially equivalent to the case where the heat seal process is not performed, such as when only a weak welding force is applied pinpointly. I will.

A Natto container 1 Container body part 2 Lid part parts 3 and 4 Flange part 5 V-shaped groove 6 Recessed part 7 Standing wall 7a High wall part 7b Low wall part 8 Recessed part

Claims (7)

A natto container into which natto can be placed,
The natto container is
A container body portion having a flange portion, and a lid portion having a flange portion,
The container body part and the lid part are connected via a hinge part at the edge of each flange part,
The container body part and the lid part are formed of a foam material,
The container body is
In the periphery of the concave container part of the container main body part, comprising a standing wall erected above the surface of the flange part of the container main body part,
The lid portion is
A fitting recess into which the standing wall is fitted when the lid is closed;
When the lid is closed with respect to the container body, the fitting recess of the lid fits into the standing wall of the container body, and the gap between the standing wall and the fitting recess A natto container characterized in that the closed state is maintained by the frictional force of. The natto container according to claim 1, wherein the standing wall includes a high wall portion having a high height and a low wall portion having a low height. The natto container according to claim 1 or 2, wherein the standing wall includes a low wall portion at a position on the center side on the front end side facing the hinge portion. The natto container according to any one of claims 1 to 3, wherein the standing wall includes a high wall portion at a position on an end portion side on a front end side facing the hinge portion. The concave container portion is substantially rectangular in plan view,
The natto container according to any one of claims 1 to 4, wherein the standing wall includes a high wall portion at corners of the four corners of the substantially rectangular shape. The natto container according to any one of claims 1 to 5, wherein the concave container part has a length of 5 to 13 cm in plan view. When pressing force is applied to the front and rear concave containers facing the hinge, the standing wall bends and the frictional force between the standing wall and the mating recess decreases to close the lid. The natto container according to any one of claims 1 to 6, wherein the natto container is configured to be loosened and opened by a resilience of the hinge portion.