Cultivation device

Abstract

To provide a cultivation device that can float in a culture solution even when constructed using a single resin sheet material.SOLUTION: A tray 1 cultivates cultivation targets P that grow in a nutrient solution. The tray 1 includes a boat-shaped main body 10 made of a single resin sheet material. The main body 10 includes a bottom wall 20, side walls 40 that rise from the bottom wall 20, and a tubular planting section 70 that rises from the bottom wall 20 while being surrounded by the side walls 40 and houses the cultivation targets P inside. At least some of the bottom wall 20 and the side walls 40 constitute a buoyancy generating section 90 that pushes away a nutrient solution W to generate buoyancy equal to the weight of the pushed-away nutrient solution W. The tray 1 floats in the nutrient solution W by using the buoyancy generated by the buoyancy generating section 90.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a cultivation device. [Background technology]

[0002] Conventionally, cultivation devices used for hydroponic cultivation have been known (see, for example, Patent Documents 1 and 2). The cultivation device described in Patent Document 1 is a cultivation bed and has a planar main body made of a foam material or the like that can float in a culture solution. The cultivation device described in Patent Document 2 is a hydroponic cultivation panel that floats on a culture solution and has an upper sheet made of a thin plastic sheet and a lower sheet whose periphery is adhesively sealed to the upper sheet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-17321 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-10324 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the cultivation device described in Patent Document 1 is prone to becoming large because the main body must be manufactured using a material such as a thick foam plate to keep the entire device afloat. Furthermore, the foam material used to manufacture the main body is prone to breakage, such as cracks and chips, and dirt easily remains on the surface. On the other hand, the cultivation device described in Patent Document 2 is constructed using a thin plastic material, which makes it less prone to cracks and chips and easier to clean. However, the cultivation device described in Patent Document 2 requires a hollow structure by forming a space between the upper and lower sheets, which makes the cultivation device prone to becoming large. Furthermore, peeling is prone to occur at the adhesive points between the upper and lower sheets. If peeling occurs, nutrient solution accumulates in the space between the upper and lower sheets, making cleaning difficult. To address this issue, it is possible to construct the cultivation device using a single thin plastic sheet. However, thin plastic generally has a higher specific gravity than thick foam materials, and many have a specific gravity exceeding 1. Therefore, if a cultivation device is constructed using a single thin plastic sheet, the cultivation device may be partially or entirely submerged in the culture solution, causing algae to grow in the submerged parts, which requires cleaning and increases the maintenance costs of the cultivation device.

[0005] An object of the present invention is to provide a cultivation device that can float in a culture solution even when constructed using a single resin sheet material. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the object, the cultivation device of the present invention is a cultivation device for cultivating a cultivation object that grows in a nutrient solution, and comprises a main body portion that is generally boat-shaped and made of a single sheet of resin material, and the main body portion comprises a bottom wall, side walls that rise from the bottom wall, and a tubular planting portion that is surrounded by the side walls and rises from the bottom wall and contains the cultivation object inside, and at least a portion of the bottom wall and the side walls constitute a buoyancy generating portion that pushes aside the nutrient solution and generates buoyancy equivalent to the weight of the nutrient solution displaced, and the cultivation device floats in the nutrient solution by utilizing the buoyancy generated by the buoyancy generating portion.

[0007] According to the present invention, a cultivation device capable of floating in nutrient solution can be obtained by forming the main body into a boat-like shape. The main body can be obtained by vacuum forming a single thin resin sheet material made of plastic such as polyvinyl chloride. This eliminates the need to manufacture the main body using a thick foam material, as in conventional cultivation devices, thereby reducing the overall size of the cultivation device. Furthermore, in this case, the main body can be made more durable and easier to clean than a configuration using foam material. Furthermore, because the main body can be constructed from a single resin sheet material, there is no need to bond upper and lower sheets together to create a hollow structure, as in conventional cultivation devices. Therefore, there is no need to deal with peeling of the bonded portions or nutrient solution penetrating into the hollow structure, allowing cultivation targets to be cultivated with low management costs. Thus, even when constructed using a single resin sheet material, a cultivation device capable of floating in nutrient solution can be provided.

[0008] In this case, it is preferable that the interior of the planting section is penetrated in the vertical direction, and the inner peripheral surface of the planting section forms a tapered surface that decreases in diameter toward the bottom side of the bottom wall. With this configuration, by providing a tapered surface inside the planting section, for example, sprouts of the cultivation object can be grown along the tapered surface so that they gradually spread from the side where the roots are located. As a result, when multiple sprouts of the cultivation object housed in the planting section grow large, the root-side portions of the multiple sprouts can be easily brought close to each other and grouped together, making it easier to stabilize the posture of the cultivation object.

[0009] Preferably, the bottom wall is provided with ribs projecting from the lower surface above the upper surface, the ribs being composed of a first rib extending in a direction intersecting the vertical direction and a second rib extending intersecting the first rib. With this configuration, the upper surface of the bottom wall of the main body is provided with a plurality of ribs extending in two directions intersecting the vertical direction, consisting of the first rib and the second rib, thereby improving the strength of the main body. This makes the main body less susceptible to deformation, thereby stably maintaining the buoyancy generated by the buoyancy generating portion.

[0010] The cultivation device may further include a first connecting portion provided on a first side wall located on one side of the side walls in a transverse direction intersecting the vertical direction, and a second connecting portion provided on a second side wall located on the other side of the side walls in the transverse direction, the first connecting portion including a flange portion protruding to the one side and a protruding portion protruding downward from the flange portion, and the second connecting portion including a bulging portion protruding from the second side wall to the one side and a fitting hole formed on an upper surface of the bulging portion into which the protruding portion fits, and the first connecting portion and the second connecting portion are preferably connected via the protruding portion and the fitting hole to connect multiple cultivation devices in the transverse direction. According to this configuration, multiple cultivation devices can be connected in the transverse direction by connecting the first connecting portion provided on the first side wall and the second connecting portion provided on the second side wall. This facilitates the movement of multiple cultivation devices together, facilitating the installation, transportation, and recovery of the cultivation devices.

[0011] Furthermore, it is preferable that the protruding portion of the first connecting portion has a first recess recessed from the upper surface of the flange portion in the protruding direction, and the bulging portion of the second connecting portion has a second recess recessed from the outer surface of the second side wall in the bulging direction and open downward, and the protruding portion is fitted into the first recess in the vertical direction, the second recess is fitted into the bulging portion in the vertical direction, and the outer surface of the main body portion is fitted into the inner surface of the main body portion, thereby allowing multiple cultivation devices to be stacked in the vertical direction. With this configuration, multiple cultivation devices can be stacked in the vertical direction. In this case, the protruding portion of the first connecting portion is fitted into the first recess of the first connecting portion in the vertical direction. In addition, the second recess of the second connecting portion is fitted into the bulging portion of the second connecting portion in the vertical direction. The outer surface of the main body portion is fitted into the inner surface of the main body portion. Therefore, multiple cultivation devices are less bulky in both the vertical direction and the cross direction, which contributes to space saving. Therefore, the storage costs and transportation costs of the cultivation devices can be reduced. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a cultivation device that can float in a culture solution even when constructed using a single resin sheet material. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of a cultivation device according to an embodiment of the present invention. [Figure 2] Side view of the cultivation device. [Figure 3] Top view of the cultivation device. [Figure 4] 4 is a cross-sectional view taken along line AA in FIG. 3. [Figure 5] FIG. 2 is an enlarged view of the main parts of the first and second connecting parts in the cultivation device. [Figure 6] FIG. 1 is a perspective view of a plurality of connected cultivation devices. [Figure 7] FIG. 7 is a cross-sectional view taken along line BB in FIG. 6. [Figure 8] FIG. 1 is a perspective view of a plurality of stacked cultivation devices. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described below with reference to FIGS. 1 to 8. The cultivation device according to this embodiment is a tray 1 used for hydroponic cultivation, and is used to cultivate a cultivation target P (see FIG. 4) suspended in a culture solution W (see FIG. 6) composed of water or a liquid in which fertilizer or the like has been added to water. In the following description, for convenience of explanation, the height direction of the tray 1 will be referred to as the "vertical direction Z," one side of the vertical direction Z will be referred to as the "upper side Z1," and the other side will be referred to as the "lower side Z2." Furthermore, among the intersecting directions that intersect the vertical direction Z, the long side direction of the tray 1 will be referred to as the "front-rear direction X," one side of the front-rear direction X will be referred to as the "front side X1," and the other side of the front-rear direction X will be referred to as the "rear side X2." Furthermore, the short side direction of the tray 1 will be referred to as the "width direction Y," one side of the width direction Y will be referred to as the "right side Y1," and the other side will be referred to as the "left side Y2."

[0015] As shown in FIG. 1, the tray 1 includes a main body 10. The main body 10 is formed into a boat-like shape by, for example, vacuum forming a single sheet of thermoplastic resin. Various synthetic resins, such as PVC (polyvinyl chloride), PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), PS (polystyrene), or PC (polycarbonate), can be used as the thermoplastic resin. The main body 10 includes a plate-shaped bottom wall 20 extending in the front-rear direction X and the width direction Y, side walls 40 rising from the edges of the bottom wall 20 to the upper side Z1, and a plurality of planting sections 70 rising from the bottom wall 20 and surrounded by the side walls 40.

[0016] The bottom wall 20 has a plurality of ribs 30 that protrude from its upper surface to the upper side Z1. The ribs 30 are formed by pushing the bottom wall 20 from the lower surface side to the upper surface side, causing them to protrude from the upper surface. That is, the bottom wall 20 is provided with the ribs 30 that protrude from the lower surface above the upper surface. As a result of the formation of the ribs 30, a plurality of recesses 21 that open to the lower side Z2 (downward) are formed on the lower surface of the bottom wall 20, as shown in FIG. 2. As shown in FIG. 3, the rib 30 has a plurality of first ribs 31 that extend in the front-rear direction X and a plurality of second ribs 32 that extend in the width direction Y, intersecting the first ribs 31, and these first ribs 31 and second ribs 32 are arranged in a lattice pattern. As a result of the arrangement of the first ribs 31 and the second ribs 32, a plurality of approximately rectangular frame-shaped compartments 22 that open to the upper side Z1 (upward) are formed on the upper surface of the bottom wall 20.

[0017] As shown in FIG. 1 , the side walls 40 rise from both edges of the bottom wall 20 in the front-rear direction X and the width direction Y toward the upper side Z1. The side walls 40 include a first side wall 41 located on the front side X1, a second side wall 42 located on the rear side X2, a third side wall 43 located on the right side Y1, and a fourth side wall 44 located on the left side Y2. The first side wall 41 is formed with a first connecting portion 50, which is one of the structures for connecting to other trays 1. The first connecting portion 50 includes a flange portion 51 that protrudes from the upper edge of the first side wall 41 toward the front side X1. The flange portion 51 is formed with a plurality of protrusions 52 (three in this embodiment) that protrude toward the lower side Z2. The protrusions 52 are formed by pressing the flange portion 51 downward from the upper surface side.

[0018] As shown in FIG. 7 , the outer surface of the protrusion 52 includes a reverse tapered portion 53, a tapered portion 54, and a bottom portion 55. The reverse tapered portion 53 is inclined so as to be positioned outward in the width direction Y from the flange portion 51 toward the lower side Z2. The tapered portion 54 is inclined so as to be positioned inward in the width direction Y from the lower end of the reverse tapered portion 53 toward the lower side Z2. The bottom portion 55 is formed at the lower end of the tapered portion 54 and extends in the width direction Y. With this configuration, a first recess 56 is formed in the portion of the upper surface of the flange portion 51 where the protrusion 52 is formed, the first recess 56 being recessed in the protruding direction of the protrusion 52. The inner surface shape of the first recess 56 conforms to the outer surface shape of the protrusion 52.

[0019] As shown in FIG. 1, the second side wall 42 is formed with a second connecting portion 60, which is one of the structures for connecting to another tray 1. The second connecting portion 60 has a plurality of bulging portions 61 (three in this embodiment) that bulge from the second side wall 42 toward the front side X1 (i.e., inward). The bulging portions 61 are formed by pushing the second side wall 42 from the outer surface side to the inner surface side. As shown in FIG. 3, the bulging portions 61 have an upper surface portion 62 (upper surface) that extends from the upper edge of the second side wall 42 toward the front side X1, and a side surface portion 63 that extends from the edge of the upper surface portion 62 toward the lower side Z2. A fitting hole 64 is formed in the upper surface portion 62, penetrating in the vertical direction Z. The fitting hole 64 is fitted with the protrusion 52 of the first connecting portion 50 described above. With this configuration, a second recess 65 is formed in the outer surface of the second side wall 42 at the portion where the bulging portions 61 are formed. The second recess 65 is recessed from the outer surface of the second side wall 42 in the expanding direction of the bulging portion 61 and is open to the lower side Z2.

[0020] As shown in FIG. 1, the planting section 70 is formed rising from the bottom wall 20 of the main body 10 to the upper side Z1. That is, the planting section 70 is surrounded by the side wall 40 and rises from the bottom wall 20. In this embodiment, the planting section 70 is arranged at the intersection of the first rib 31 and the second rib 32, and multiple planting sections 70 are provided. With this arrangement, the planting section 70 is supported from the front, back, left, and right by the first rib 31 and the second rib 32, making it easier to maintain the strength of the planting section 70. As shown in FIG. 4, the planting section 70 is formed in a cylindrical shape whose outer surface decreases in diameter toward the upper side Z1. A storage hole 71 penetrating in the vertical direction Z is formed in the center of the planting section 70. That is, the interior of the planting section 70 penetrates the bottom wall 20 in the vertical direction Z. The inner surface of the storage hole 71 forms a tapered surface 72 whose diameter decreases toward the bottom side of the bottom wall 20.

[0021] A plant as a cultivation object P is housed inside the planting section 70 formed in this manner. An example of the cultivation object P is a leek. The leek is housed in the planting section 70 by placing a sponge-like fixing part 73 in the housing hole 71, with the roots extending from the fixing part 73 to the lower side Z2 and the sprouts extending from the fixing part 73 to the upper side Z1. When housing the cultivation object P, the inner peripheral surface of the housing hole 71 forms a tapered surface 72, which allows the sprouts of the cultivation object P to grow along the tapered surface 72, gradually spreading from the side where the roots are located. As a result, when multiple sprouts of the cultivation object P housed in the planting section 70 grow large, the root-side portions of the multiple sprouts tend to approach each other and gather together, making it easier to stabilize the posture of the cultivation object P.

[0022] Next, the manufacturing and use of the tray 1 configured as described above will be described. When manufacturing the tray 1, first, a sheet of resin sheet material made of the thermoplastic resin described above is prepared. The thickness of the sheet of resin sheet material can be set as appropriate. For example, the thickness of the sheet of resin sheet material can be set to approximately 1 mm to 9 mm. Setting the thickness to approximately 3 mm or less is preferable because it helps prevent the tray 1 from becoming larger compared to trays 1 whose main body is made of a conventional foam material. Setting the thickness to approximately 1 mm is even more preferable. The prepared sheet of resin sheet material is then vacuum-formed. Specifically, the prepared sheet of resin sheet material is heated and softened, placed on a mold (not shown), and vacuum-suctioned to deform it into a shape that conforms to the mold surface. It is then cooled and hardened, and then cut out. This completes the tray 1, which includes a main body 10 composed of a bottom wall 20, side walls 40, and a mounting portion 70.

[0023] The tray 1 can be used singly, or multiple trays 1 can be manufactured and connected together for use. In this case, multiple trays 1 can be connected by connecting the first connecting portion 50 and the second connecting portion 60. Specifically, as shown in FIG. 5, two trays 1 are lined up in the front-rear direction X. Then, the first connecting portion 50 of one tray 1 (the tray 1 arranged on the front side X1) is moved toward the second connecting portion 60 of the other tray 1 (the tray 1 arranged on the rear side X2) from the upper side Z1 toward the lower side Z2 (indicated by the arrow). As a result, the protrusion 52 of the first connecting portion 50 fits into the fitting hole 64 of the second connecting portion 60, and the trays 1 are connected together as shown in FIG. 6.

[0024] 7, the protrusion 52 is formed with a tapered portion 54 and an inverse tapered portion 53. Therefore, the tapered portion 54 first functions as a guide that slides against the edge of the fitting hole 64, allowing the protrusion 52 to smoothly fit into the fitting hole 64. Then, when the boundary portion 57 between the tapered portion 54 and the inverse tapered portion 53 moves over the edge of the fitting hole 64 toward the lower side Z2, the boundary portion 57 is caught against the edge of the fitting hole 64 in a manner that makes it difficult for the boundary portion 57 to move upward Z1. This causes the outer surface of the protrusion 52 to fit into the fitting hole 64, and the boundary portion 57 functions as a retainer. In this state, the lower surface of the flange portion 51 of the first connecting portion 50 abuts against the upper surface portion 62 of the second connecting portion 60, thereby stably supporting the first connecting portion 50 by the second connecting portion 60. In this way, by connecting the first connecting portion 50 and the second connecting portion 60 via the protruding portion 52 and the fitting hole 64, a plurality of trays 1 can be connected in the front-rear direction X (transverse direction).

[0025] As shown in FIG. 6 , two trays 1 connected in the front-rear direction X are housed in a water tank 80 into which a culture solution W has been introduced. At this time, if the specific gravity of the resin sheet material constituting the main body 10 of the tray 1 is 1 or more, the tray 1 will tend to sink in the culture solution W. If the tray 1 sinks in the culture solution W, algae and the like are likely to grow in the sunken portion, making cleaning difficult. However, in this embodiment, the main body 10 of the tray 1 is formed into a boat shape by the bottom wall 20 and the side walls 40. As the main body 10 tries to sink, it pushes aside the culture solution W, generating buoyancy equal to the weight of the displaced culture solution W, and this buoyancy acts on the main body 10.

[0026] That is, the buoyancy generating unit 90 is formed by at least a portion of the bottom wall 20 and the side wall 40 of the main body 10, and the buoyancy generated by the buoyancy generating unit 90 allows the tray 1 to float in the culture solution W. This makes it possible to suppress the growth of algae and reduce the maintenance costs of the tray 1, such as cleaning. Note that the buoyancy is mainly affected by the volume of the buoyancy generating unit 90, so these volumes can be adjusted appropriately based on the total load weight of the cultivation targets P to be loaded on the tray 1 and the weight of the tray 1. In this configuration, the trays 1 are connected in the front-rear direction X, so that multiple trays 1 can be moved together in the aquarium 80 while floating in the culture solution W, as shown by the arrow in FIG. 6.

[0027] As shown in FIG. 8, a plurality of trays 1 before use or after use can be stacked in the vertical direction Z for storage. In this case, the protrusion 52 of one tray 1 (upper side Z1) fits into the first recess 56 of the other tray 1 (lower side Z2) in the vertical direction Z. Although not shown, the second recess 65 of one tray 1 (upper side Z1) fits into the bulge 61 of the other tray 1 (lower side Z2) in the vertical direction Z. The lower surface of the bottom wall 20 of one tray (upper side Z1) abuts against the upper surface of the bottom wall 20 of the other tray (lower side Z2), and the outer surface of the side wall 40 of one tray (upper side Z1) abuts against the inner surface of the side wall 40 of the other tray (lower side Z2). That is, the outer surface of the main body 10 of one tray (upper side Z1) fits into the inner surface of the main body 10 of the other tray (lower side Z2). Therefore, compared to a case where there is no fitting structure as described above, the dimension in the vertical direction Z when a plurality of trays 1 are stacked can be made smaller.

[0028] According to the above-described embodiment, the tray 1 (cultivation device) can be obtained by forming the main body 10 into a boat-like shape. The main body 10 can be obtained by vacuum forming a thin resin sheet made of plastic such as polyvinyl chloride. This eliminates the need to manufacture the main body 10 using a thick foam or other material, as in conventional trays 1, thereby preventing the tray 1 from becoming too large. Furthermore, compared to structures using foam, this configuration improves the durability of the main body 10 and makes cleaning the main body 10 easier. Furthermore, because the main body 10 can be constructed from a single resin sheet, it is not necessary to bond upper and lower sheets together to create a hollow structure, as in conventional trays 1. This eliminates the need to deal with peeling of the bonded portions or the infiltration of the culture solution W into the hollow structure, allowing the cultivation target P to be cultivated with low management costs. Thus, even when constructed using a single resin sheet, a tray 1 capable of floating in the culture solution W can be provided.

[0029] Furthermore, according to the above-described embodiment, by providing the tapered surface 72 inside the planting section 70, the sprouts of the cultivation object P can be grown so as to gradually spread from the side where the roots are located along the tapered surface 72. As a result, when multiple sprouts of the cultivation object P housed in the planting section 70 grow large, the root-side portions of the multiple sprouts can be easily brought close to each other and grouped together, making it easier to stabilize the posture of the cultivation object P.

[0030] Furthermore, according to the above-described embodiment, a plurality of ribs 30, including the first rib 31 and the second rib 32, are formed on the upper surface of the bottom wall 20 of the main body 10, extending in two directions intersecting the vertical direction Z, thereby improving the strength of the main body 10. This makes it difficult for the main body 10 to deform, and therefore the buoyancy generated by the buoyancy generating part 90 can be stably maintained.

[0031] Furthermore, according to the above-described embodiment, by connecting the first connecting portion 50 provided on the first side wall 41 and the second connecting portion 60 provided on the second side wall 42, it is possible to connect multiple trays 1 in the front-rear direction X (the cross direction). This makes it easy to move multiple trays 1 together, and makes it easy to install, transport, or collect the trays 1.

[0032] Furthermore, according to the above-described embodiment, multiple trays 1 can be stacked in the vertical direction Z. At this time, the protrusion 52 of the first connecting portion 50 fits into the first recess 56 of the first connecting portion 50 in the vertical direction Z. The second recess 65 of the second connecting portion 60 fits into the bulge 61 of the second connecting portion 60 in the vertical direction Z. The outer surface of the main body 10 fits into the inner surface of the main body 10. Therefore, multiple trays 1 are less likely to be bulky in both the vertical direction Z and the intersecting directions (front-rear direction X, width direction Y), which contributes to space saving. Therefore, the storage costs and transportation costs of the trays 1 can be reduced.

[0033] The above-described embodiments merely illustrate typical aspects of the present invention, and the present invention is not limited thereto. For example, in this embodiment, leeks are used as an example of the cultivation target P, but this is not limiting, and various plants may be used as the cultivation target P. Furthermore, in this embodiment, the main body 10 is formed in a generally rectangular box shape, but the shape of the main body 10 is not limited thereto. As long as the main body 10 is formed in an overall boat shape, it may be formed, for example, with a circular bottom wall 20 and a cylindrical side wall 40. Furthermore, the arrangement of the ribs 30 does not necessarily have to be a lattice pattern. Furthermore, the arrangement and number of the planting sections 70 can also be set as appropriate. [Explanation of symbols]

[0034] P Cultivation target W culture solution 1 tray (cultivation device) 10 Main body 20 Bottom Wall 40 side wall 70 Planting section 90 Buoyancy generating part

Claims

1. A cultivation device for cultivating a cultivation target that grows in a culture solution, A boat-shaped main body is made of a single resin sheet material, The main body includes a bottom wall, a side wall rising from the bottom wall, and a cylindrical planting section that is surrounded by the side wall, rises from the bottom wall, and accommodates a cultivation target therein. at least a part of the bottom wall and the side wall constitutes a buoyancy generating portion that displaces the culture solution and generates buoyancy corresponding to the weight of the displaced culture solution; A cultivation device characterized in that the cultivation device floats in the culture solution by utilizing the buoyancy generated by the buoyancy generating unit.

2. The cultivation device according to claim 1, characterized in that the interior of the planting section is penetrated in the vertical direction, and the inner surface of the planting section forms a tapered surface whose diameter decreases as it approaches the bottom side of the bottom wall.

3. The bottom wall is provided with a rib that protrudes from the lower surface above the upper surface, The cultivation device according to claim 1, characterized in that the ribs are composed of a first rib extending in a direction intersecting the vertical direction and a second rib extending intersecting the first rib.

4. a first connecting portion provided on a first side wall located on one side in a direction intersecting the vertical direction among the side walls; a second connecting portion provided on a second side wall of the side walls that is located on the other side in the intersecting direction, The first connecting portion includes a flange portion protruding toward the one side and a protruding portion protruding downward from the flange portion, the second connecting portion includes a bulging portion that bulges out from the second side wall toward the one side, and a fitting hole that is formed on an upper surface of the bulging portion and into which the protrusion is fitted, The cultivation device according to claim 1, wherein the first connecting portion and the second connecting portion are connected via the protrusion and the fitting hole, so that a plurality of the cultivation devices can be connected in the cross direction.

5. The protruding portion of the first connecting portion is provided with a first recess that is recessed in a protruding direction from an upper surface of the flange portion, the bulging portion of the second connecting portion is provided with a second recess that is recessed from the outer surface of the second side wall in the bulging direction and opens downward, The cultivation device described in claim 4, characterized in that the protrusion fits into the first recess in the vertical direction, the second recess fits into the bulge in the vertical direction, and the outer surface of the main body fits into the inner surface of the main body, thereby allowing multiple units to be stacked in the vertical direction.

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