Unit bathroom

Abstract

To provide a unit bathroom that can reduce installation dimensions while providing sufficient connection strength in the necessary areas. [Solution] A unit bath comprising a bathtub, a washing area floor, a plurality of front wall members, a plurality of rear wall members, a plurality of left wall members, a plurality of right wall members, a first surface joint member connecting the plurality of front wall members, a second surface joint member connecting the plurality of rear wall members, a third surface joint member connecting the plurality of left wall members, and a fourth surface joint member connecting the plurality of right wall members, wherein each of the first to fourth surface joint members has a pair of first to fourth surface engaging portions and a first to fourth surface connecting portion, and the length of the pair of first surface engaging portions in the front-to-back direction is smaller than at least one of the length of the pair of third surface engaging portions in the left-to-right direction and the length of the pair of fourth surface engaging portions in the left-to-right direction.

Description

Technical Field

[0004]

[0001] Aspects of the present invention generally relate to unit baths.

Background Art

[0002] Unit baths in which wall members such as wall panels and doors are connected by connecting members are known (for example, Patent Document 1). In such unit baths, in order to install a unit bath as large as possible in a limited bathroom space, it is required to reduce the dimensions (installation dimensions) required for installing the unit bath.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a means for reducing the installation dimensions of the unit bath, it is conceivable to reduce the depth of the connecting member located at the outermost peripheral portion of the unit bath. However, if the depth of all the connecting members provided in the unit bath is reduced, there is a problem that the connection strength is reduced.

[0005] Aspects of the present invention have been made based on the recognition of such problems, and an object thereof is to provide a unit bath that can reduce the installation dimensions while providing sufficient connection strength to necessary portions.

Means for Solving the Problems

[0006] The first invention comprises a bathtub whose length in the left-right direction is greater than its length in the front-back direction, a washing area floor provided behind the bathtub, a plurality of front wall members provided above the front end of the bathtub and arranged in the left-right direction, a plurality of rear wall members provided above the rear end of the washing area floor and arranged in the left-right direction, a plurality of left wall members provided above the left end of the bathtub and the left end of the washing area floor and arranged in the front-back direction, a plurality of right wall members provided above the right end of the bathtub and the right end of the washing area floor and arranged in the front-back direction, a first surface joint member connecting the plurality of front wall members, a second surface joint member connecting the plurality of rear wall members, a third surface joint member connecting the plurality of left wall members, and a fourth surface joint member connecting the plurality of right wall members, wherein the first surface joint member extends in the front-back direction and connects the plurality of front wall members. The unit bath has a pair of first surface engagement portions that engage with a side wall member, and a first surface connecting portion that connects the pair of first surface engagement portions together; the second surface joint member has a pair of second surface engagement portions that extend in the front-rear direction and engage with the plurality of rear wall members, and a second surface connecting portion that connects the pair of second surface engagement portions together; the third surface joint member has a pair of third surface engagement portions that extend in the left-right direction and engage with the plurality of left side wall members, and a third surface connecting portion that connects the pair of third surface engagement portions together; the fourth surface joint member has a pair of fourth surface engagement portions that extend in the left-right direction and engage with the plurality of right side wall members, and a fourth surface connecting portion that connects the pair of fourth surface engagement portions together; and the length of the pair of first surface engagement portions in the front-rear direction is smaller than at least one of the length of the pair of third surface engagement portions in the left-right direction and the length of the pair of fourth surface engagement portions in the left-right direction.

[0007] In this unit bathroom, the length of the pair of first surface engagement parts in the front-to-back direction is smaller than at least one of the lengths of the pair of third surface engagement parts in the left-to-right direction and the length of the pair of fourth surface engagement parts in the left-to-right direction. As a result, joint members with a small depth can be placed on the front wall members, where the connection strength is less likely to be reduced due to the small vertical length, while joint members with a large depth can be placed on the left and right wall members, where the connection strength is more likely to be reduced due to the large vertical length. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0008] The second invention is a unit bath in which, in the first invention, the length of the pair of first surface engagement portions in the front-rear direction is smaller than the length of the pair of third surface engagement portions in the left-right direction and the length of the pair of fourth surface engagement portions in the left-right direction.

[0009] In this unit bathroom, the length of the pair of first surface engagement parts in the front-to-back direction is smaller than the length of the pair of third surface engagement parts in the left-to-right direction and the length of the pair of fourth surface engagement parts in the left-to-right direction. As a result, joint members with a small depth can be placed on the front wall member, where the connection strength is less likely to be reduced due to the small vertical length, while joint members with a large depth can be placed on the left and right wall members, where the connection strength is more likely to be reduced due to the large vertical length. This allows for sufficient connection strength in the necessary areas while reducing the installation dimensions.

[0010] The third invention is a unit bath in which the length in the front-to-back direction is greater than the length in the left-to-right direction, comprising: a plurality of front wall members provided at the front end of the unit bath and arranged in the left-to-right direction; a plurality of rear wall members provided at the rear end of the unit bath and arranged in the left-to-right direction; a plurality of left wall members provided at the left end of the unit bath and arranged in the front-to-back direction; a plurality of right wall members provided at the right end of the unit bath and arranged in the front-to-back direction; a first surface joint member connecting the plurality of front wall members; a second surface joint member connecting the plurality of rear wall members; a third surface joint member connecting the plurality of left wall members; and a fourth surface joint member connecting the plurality of right wall members, wherein the first surface joint member extends in the front-to-back direction and engages with the plurality of front wall members, and the pair of first surface engagement portions A unit bath having a first surface connecting portion for connecting the members, the second surface joint member having a pair of second surface engaging portions extending in the front-rear direction and engaging with the plurality of rear wall members, and a second surface connecting portion connecting the pair of second surface engaging portions, the third surface joint member having a pair of third surface engaging portions extending in the left-right direction and engaging with the plurality of left wall members, and a third surface connecting portion connecting the pair of third surface engaging portions, the fourth surface joint member having a pair of fourth surface engaging portions extending in the left-right direction and engaging with the plurality of right wall members, and a fourth surface connecting portion connecting the pair of fourth surface engaging portions, wherein at least one of the lengths of the pair of first surface engaging portions in the front-rear direction and the lengths of the pair of second surface engaging portions in the front-rear direction is smaller than at least one of the lengths of the pair of third surface engaging portions in the left-right direction and the lengths of the pair of fourth surface engaging portions in the left-right direction.

[0011] In this unit bathroom, at least one of the lengths of the pair of first surface engagement parts in the front-to-back direction and the pair of second surface engagement parts in the front-to-back direction is smaller than at least one of the lengths of the pair of third surface engagement parts in the left-to-right direction and the pair of fourth surface engagement parts in the left-to-right direction. This allows for the placement of joint members with a small depth in the front and rear wall members, which are aligned with the shorter direction of the unit bathroom and therefore less prone to reduced connection strength, while allowing for the placement of joint members with a large depth in the left and right wall members, which are aligned with the longer direction of the unit bathroom and therefore more prone to reduced connection strength. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0012] The fourth invention is a unit bath in which, in the third invention, the length of the pair of first surface engagement portions in the front-rear direction and the length of the pair of second surface engagement portions in the front-rear direction are smaller than at least one of the length of the pair of third surface engagement portions in the left-right direction and the length of the pair of fourth surface engagement portions in the left-right direction.

[0013] In this unit bathroom, the length of the pair of first surface engagement parts in the front-to-back direction and the length of the pair of second surface engagement parts in the front-to-back direction are smaller than at least one of the length of the pair of third surface engagement parts in the left-to-right direction and the length of the pair of fourth surface engagement parts in the left-to-right direction. As a result, joint members with a small depth can be placed on the front and rear wall members, which are aligned with the shorter direction of the unit bathroom and therefore less prone to reduced connection strength, while joint members with a large depth can be placed on the left and right wall members, which are aligned with the longer direction of the unit bathroom and therefore more prone to reduced connection strength. This allows for sufficient connection strength in the necessary areas while reducing the installation dimensions.

[0014] The fifth invention is a unit bath in which, in the third invention, at least one of the lengths of the pair of first surface engagement portions in the front-rear direction and the lengths of the pair of second surface engagement portions in the front-rear direction is smaller than the lengths of the pair of third surface engagement portions in the left-right direction and the lengths of the pair of fourth surface engagement portions in the left-right direction.

[0015] With this unit bathroom, at least one of the lengths of the pair of first surface engagement parts in the front-to-back direction and the pair of second surface engagement parts in the front-to-back direction is smaller than the lengths of the pair of third surface engagement parts in the left-to-right direction and the pair of fourth surface engagement parts in the left-to-right direction. This allows for the placement of joint members with a small depth in the front and rear wall members, which are aligned with the shorter direction of the unit bathroom and therefore less prone to reduced connection strength, while allowing for the placement of joint members with a large depth in the left and right wall members, which are aligned with the longer direction of the unit bathroom and therefore more prone to reduced connection strength. As a result, sufficient connection strength can be provided in the necessary areas while reducing the installation dimensions.

[0016] The sixth invention is a combination of any one of the first to fifth inventions, comprising: a first corner joint member connecting one of the plurality of front wall members and one of the plurality of left wall members; a second corner joint member connecting one of the plurality of front wall members and one of the plurality of right wall members; a third corner joint member connecting one of the plurality of rear wall members and one of the plurality of left wall members; and a fourth corner joint member connecting one of the plurality of rear wall members and one of the plurality of right wall members. The first corner joint member further comprises a first corner engaging portion extending in the front-rear direction and engaging with one of the plurality of front wall members, a second corner engaging portion extending in the left-right direction and engaging with one of the plurality of left wall members, and a first corner connecting portion connecting the first corner engaging portion and the second corner engaging portion, and the second corner joint member further comprises a third corner engaging portion extending in the front-rear direction and engaging with one of the plurality of front wall members, a fourth corner engaging portion extending in the left-right direction and engaging with one of the plurality of right wall members, and The unit bath has a third corner engaging portion and a second corner connecting portion that connects the fourth corner engaging portion, the third corner joint member has a fifth corner engaging portion that extends in the front-rear direction and engages with one of the plurality of rear wall members, a sixth corner engaging portion that extends in the left-right direction and engages with one of the plurality of left wall members, and a third corner connecting portion that connects the fifth corner engaging portion and the sixth corner engaging portion, the fourth corner joint member has a seventh corner engaging portion that extends in the front-rear direction and engages with one of the plurality of rear wall members, an eighth corner engaging portion that extends in the left-right direction and engages with one of the plurality of right wall members, and a fourth corner connecting portion that connects the seventh corner engaging portion and the eighth corner engaging portion, and the front-rear length of the first corner engaging portion, the front-rear length of the third corner engaging portion, the front-rear length of the fifth corner engaging portion, and the front-rear length of the seventh corner engaging portion are smaller than at least one of the left-right lengths of the pair of third surface engaging portions and the left-right lengths of the pair of fourth surface engaging portions.

[0017] According to this unit bus, the length in the front-rear direction of the first angular engagement portion, the length in the front-rear direction of the third angular engagement portion, the length in the front-rear direction of the fifth angular engagement portion, and the length in the front-rear direction of the seventh angular engagement portion are smaller than at least one of the length in the left-right direction of the pair of third surface engagement portions and the length in the left-right direction of the pair of fourth surface engagement portions, so that a joint member with a small depth can be arranged at the corner of the unit bus where it is difficult for a moment to act. Thereby, while providing sufficient connection strength to the necessary parts, the installation dimensions can be reduced.

Effect of the Invention

[0018] According to an aspect of the present invention, it is possible to provide a unit bus that can reduce the installation dimensions while providing sufficient connection strength to the necessary parts.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view showing a unit bus according to the first embodiment. [Figure 2] It is a cross-sectional view showing a unit bus according to the first embodiment. [Figure 3] It is a cross-sectional view showing the periphery of the first surface joint member of the unit bus according to the first embodiment. [Figure 4] It is a cross-sectional view showing the periphery of the second surface joint member of the unit bus according to the first embodiment. [Figure 5] It is a cross-sectional view showing the periphery of the third surface joint member of the unit bus according to the first embodiment. [Figure 6] It is a cross-sectional view showing the periphery of the fourth surface joint member of the unit bus according to the first embodiment. [Figure 7] It is a cross-sectional view showing the periphery of the first corner joint member of the unit bus according to the first embodiment. [Figure 8] It is a cross-sectional view showing the periphery of the second corner joint member of the unit bus according to the first embodiment. [Figure 9] It is a cross-sectional view showing the periphery of the third corner joint member of the unit bus according to the first embodiment. [Figure 10]It is a cross-sectional view showing the periphery of the fourth corner joint member of the unit bath according to the first embodiment. [Figure 11] It is a cross-sectional view showing a modified example of the first surface joint member of the unit bath according to the first embodiment. [Figure 12] It is a perspective view showing the unit bath according to the second embodiment. [Figure 13] It is a cross-sectional view showing the unit bath according to the second embodiment.

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments will be described with reference to the drawings. In each drawing, the same reference numerals are assigned to the same components, and detailed descriptions thereof are omitted as appropriate.

[0021] (First Embodiment) FIG. 1 is a perspective view showing the unit bath according to the first embodiment. FIG. 2 is a cross-sectional view showing the unit bath according to the first embodiment. FIG. 2 is a cross-sectional view when looking from above to below between the bathtub 10 and the ceiling member 70. As shown in FIGS. 1 and 2, the unit bath 100 according to the first embodiment includes a bathtub 10, a washroom floor 20, a plurality of front wall members 31, a plurality of rear wall members 32, a plurality of left wall members 33, a plurality of right wall members 34, a first surface joint member 41, a second surface joint member 42, a third surface joint member 43, a fourth surface joint member 44, a first corner joint member 51, a second corner joint member 52, a third corner joint member 53, a fourth corner joint member 54, a first joint connecting member 61, a second joint connecting member 62, a third joint connecting member 63, a fourth joint connecting member 64, and a ceiling member 70.

[0022] The bathtub 10 is located beneath the unit bath 100. The bathtub 10 is, for example, mounted on a stand (not shown) placed on the floor of the installation space. The bathtub 10 is, for example, a roughly rectangular box shape and is open to the top. The length of the bathtub 10 in the left-right direction is greater than the length of the bathtub 10 in the front-back direction. The bathtub 10 is used, for example, when a bather immerses themselves in the water filled in the bathtub 10.

[0023] The washing area floor 20 is located beneath the unit bath 100. The washing area floor 20 is located behind the bathtub 10. The washing area floor 20 is used, for example, when a bather washes their body. In this specification, the front, rear, left, right, top, and bottom as seen from the perspective of a user standing on the washing area floor 20 and facing the bathtub 10 are referred to as "front," "rear," "left," "right," "top," and "bottom."

[0024] Multiple front wall members 31 are provided above the front end of the bathtub 10. The multiple front wall members 31 are arranged side by side in the left-right direction. In the unit bath 100, the multiple front wall members 31 include a first front wall member 31a and a second front wall member 31b. The first front wall member 31a is located to the left of the second front wall member 31b. In other words, the first front wall member 31a and the second front wall member 31b are adjacent to each other in the left-right direction.

[0025] Multiple rear wall members 32 are provided on the rear end of the washing area floor 20. The multiple rear wall members 32 are arranged in the left-right direction. In the unit bath 100, the multiple rear wall members 32 include a first rear wall member 32a and a second rear wall member 32b. The first rear wall member 32a is located to the left of the second rear wall member 32b. In other words, the first rear wall member 32a and the second rear wall member 32b are adjacent to each other in the left-right direction. The first rear wall member 32a faces the first front wall member 31a in the front-rear direction. The second rear wall member 32b faces the second front wall member 31b in the front-rear direction.

[0026] Multiple left wall members 33 are provided above the left end of the bathtub 10 and above the left end of the washing area floor 20. The multiple left wall members 33 are arranged in the front-to-back direction. In the unit bath 100, the multiple left wall members 33 include a first left wall member 33a and a second left wall member 33b. The first left wall member 33a is located in front of the second left wall member 33b. In other words, the first left wall member 33a and the second left wall member 33b are adjacent to each other in the front-to-back direction.

[0027] Multiple right wall members 34 are provided above the right end of the bathtub 10 and above the right end of the washing area floor 20. The multiple right wall members 34 are arranged in the front-to-back direction. In the unit bath 100, the multiple right wall members 34 include a first right wall member 34a and a second right wall member 34b. The first right wall member 34a is located in front of the second right wall member 34b. In other words, the first right wall member 34a and the second right wall member 34b are adjacent to each other in the front-to-back direction. The first right wall member 34a faces the first left wall member 33a in the left-to-right direction. The second right wall member 34b faces the second left wall member 33b in the left-to-right direction.

[0028] The vertical lengths of the multiple front wall members 31 are smaller than the vertical lengths of the multiple rear wall members 32. The vertical length of one of the multiple left wall members 33 that is installed above the bathtub 10 is smaller than the vertical length of one of the multiple left wall members 33 that is installed above the washing area floor 20. The vertical length of one of the multiple right wall members 34 that is installed above the bathtub 10 is smaller than the vertical length of one of the multiple right wall members 34 that is installed above the washing area floor 20. In the unit bath 100, the vertical lengths of the first front wall member 31a, the second front wall member 31b, the first left wall member 33a, and the first right wall member 34a are smaller than the vertical lengths of the first rear wall member 32a, the second rear wall member 32b, the second left wall member 33b, and the second right wall member 34b.

[0029] Each wall member is either a wall panel or a door for entering and exiting the unit bath 100. Of the wall members installed on the washing area floor 20 (first rear wall member 32a, second rear wall member 32b, second left wall member 33b, and second right wall member 34b), one is a door, and the other wall members are wall panels.

[0030] The first surface joint member 41 connects multiple front wall members 31 to each other. In the unit bathroom 100, the first surface joint member 41 connects the first front wall member 31a and the second front wall member 31b. The first surface joint member 41 is positioned on the outside (front) of the multiple front wall members 31.

[0031] The second surface joint member 42 connects multiple rear wall members 32 to each other. In the unit bathroom 100, the second surface joint member 42 connects the first rear wall member 32a and the second rear wall member 32b. The second surface joint member 42 is positioned on the outside (rear) of the multiple rear wall members 32.

[0032] The third-sided joint member 43 connects multiple left-side wall members 33 to each other. In the unit bathroom 100, the third-sided joint member 43 connects the first left-side wall member 33a and the second left-side wall member 33b. The third-sided joint member 43 is positioned on the outside (left side) of the multiple left-side wall members 33.

[0033] The fourth-sided joint member 44 connects multiple right-side wall members 34 to each other. In the unit bathroom 100, the fourth-sided joint member 44 connects the first right-side wall member 34a and the second right-side wall member 34b. The fourth-sided joint member 44 is positioned on the outside (right side) of the multiple right-side wall members 34.

[0034] The first corner joint member 51 connects one of the multiple front wall members 31 and one of the multiple left wall members 33. In the unit bathroom 100, the first corner joint member 51 connects the first front wall member 31a and the first left wall member 33a. The first corner joint member 51 is located at the left front corner of the unit bathroom 100, outside (left front) of one of the multiple front wall members 31 and one of the multiple left wall members 33.

[0035] The second corner joint member 52 connects one of the multiple front wall members 31 and one of the multiple right wall members 34. In the unit bathroom 100, the second corner joint member 52 connects the second front wall member 31b and the first right wall member 34a. In other words, the second corner joint member 52 is located outside (to the right front) of one of the multiple front wall members 31 and one of the multiple right wall members 34 at the right front corner of the unit bathroom 100.

[0036] The third corner joint member 53 connects one of the multiple rear wall members 32 to one of the multiple left wall members 33. In the unit bathroom 100, the third corner joint member 53 connects the first rear wall member 32a to the second left wall member 33b. In other words, the third corner joint member 53 is located outside (to the left rear) of one of the multiple rear wall members 32 and one of the multiple left wall members 33 at the left rear corner of the unit bathroom 100.

[0037] The fourth corner joint member 54 connects one of the multiple rear wall members 32 and one of the multiple right wall members 34. In the unit bathroom 100, the fourth corner joint member 54 connects the second rear wall member 32b and the second right wall member 34b. In other words, the fourth corner joint member 54 is located outside (to the right rear) of one of the multiple rear wall members 32 and one of the multiple right wall members 34 at the right rear corner of the unit bathroom 100.

[0038] The first joint connecting member 61 is provided on the upper part of the unit bath 100. The first joint connecting member 61 connects the upper end of the first corner joint member 51, the upper end of the second corner joint member 52, and the upper end of the first surface joint member 41.

[0039] The second joint connecting member 62 is provided on the upper part of the unit bath 100. The second joint connecting member 62 connects the upper end of the third corner joint member 53, the upper end of the fourth corner joint member 54, and the upper end of the second surface joint member 42.

[0040] The third joint connecting member 63 is provided on the upper part of the unit bath 100. The third joint connecting member 63 connects the upper end of the first corner joint member 51, the upper end of the third corner joint member 53, and the upper end of the third surface joint member 43.

[0041] The fourth joint connecting member 64 is provided on the upper part of the unit bath 100. The fourth joint connecting member 64 connects the upper end of the second corner joint member 52, the upper end of the fourth corner joint member 54, and the upper end of the fourth face joint member 44.

[0042] The ceiling material 70 is installed above the unit bath 100. The ceiling material 70 is installed above the bathtub 10 and the washing area floor 20.

[0043] The following describes the connection between each joint member and each wall member. Figure 3 is a cross-sectional view showing the area around the first surface joint member of the unit bath according to the first embodiment. As shown in Figure 3, the first front wall member 31a comprises a base material 31a1, a steel plate 31a2, and a folded portion 31a3. The steel plate 31a2 is provided behind the base material 31a1. The folded portion 31a3 is provided on the left and right side surfaces of the steel plate 31a2 and includes a portion that is folded forward and a portion that is folded backward. The folded portion 31a3 is elastic. Similarly, the second front wall member 31b comprises a base material 31b1, a steel plate 31b2, and a folded portion 31b3. The steel plate 31b2 is provided behind the base material 31b1. The folded portion 31b3 is provided on the left and right side surfaces of the steel plate 31b2 and includes a portion that is folded forward and a portion that is folded backward. The folded portion 31b3 is elastic.

[0044] The first surface joint member 41 has a pair of first surface engaging portions 41x and a first surface connecting portion 41y. Each of the pair of first surface engaging portions 41x has a first surface extending portion 41x1 and a first surface folded portion 41x2. The first surface extending portion 41x1 extends in the front-rear direction. The first surface folded portion 41x2 is folded forward from the rear end of the first surface extending portion 41x1. The first surface folded portion 41x2 is elastic. The pair of first surface engaging portions 41x engage with a plurality of front wall members 31. In the unit bath 100, one of the pair of first surface engaging portions 41x engages with the first front wall member 31a, and the other of the pair of first surface engaging portions 41x engages with the second front wall member 31b. More specifically, one of the pair of first surface engagement portions 41x, the folded portion 41x2 of the first surface engagement portion 41x, engages with the folded portion 31a3 of the first front wall member 31a, and the other of the pair of first surface engagement portions 41x, the folded portion 31b3 of the second front wall member 31b. The first surface connecting portion 41y connects the pair of first surface engagement portions 41x. More specifically, the first surface connecting portion 41y connects the front ends of the pair of first surface extending portions 41x1.

[0045] When attaching the first front wall member 31a and the second front wall member 31b to the first surface joint member 41, the folded portion 31a3 of the first front wall member 31a and the folded portion 31b3 of the second front wall member 31b are fitted between the pair of first surface engaging portions 41x of the first surface joint member 41 (between the pair of first surface folded portions 41x2). The folded portion 31a3 of the first front wall member 31a and the folded portion 31b3 of the second front wall member 31b are fitted together in such a way that they push apart the pair of first surface engaging portions 41x of the first surface joint member 41 (between the pair of first surface folded portions 41x2), thereby biasing them in opposite directions. When the folded portion 31a3 of the first front wall member 31a and the folded portion 31b3 of the second front wall member 31b are fitted together, the first front wall member 31a and the second front wall member 31b are fixed in the same plane via the first surface joint member 41.

[0046] Figure 4 is a cross-sectional view showing the area around the second surface joint member of the unit bath according to the first embodiment. As shown in Figure 4, the first rear wall member 32a comprises a base material 32a1, a steel plate 32a2, and a folded portion 32a3. The steel plate 32a2 is provided in front of the base material 32a1. The folded portion 32a3 is provided on the left and right side surfaces of the steel plate 32a2 and includes a portion that is folded back toward the rear and a portion that is folded back toward the front. The folded portion 32a3 is elastic. Similarly, the second rear wall member 32b comprises a base material 32b1, a steel plate 32b2, and a folded portion 32b3. The steel plate 32b2 is provided in front of the base material 32b1. The folded portion 32b3 is provided on the left and right side surfaces of the steel plate 32b2 and includes a portion that is folded back toward the rear and a portion that is folded back toward the front. The folded portion 32b3 is elastic.

[0047] The second surface joint member 42 has a pair of second surface engaging portions 42x and a second surface connecting portion 42y. Each of the pair of second surface engaging portions 42x has a second surface extending portion 42x1 and a second surface folded portion 42x2. The second surface extending portion 42x1 extends in the front-rear direction. The second surface folded portion 42x2 is folded back from the front end of the second surface extending portion 42x1 toward the rear. The second surface folded portion 42x2 is elastic. The pair of second surface engaging portions 42x engage with a plurality of rear wall members 32. In the unit bath 100, one of the pair of second surface engaging portions 42x engages with the first rear wall member 32a, and the other of the pair of second surface engaging portions 42x engages with the second rear wall member 32b. More specifically, one second surface folded portion 42x2 of the pair of second surface engaging portions 42x engages with the folded portion 32a3 of the first rear wall member 32a, and the other second surface folded portion 42x2 of the pair of second surface engaging portions 42x engages with the folded portion 32b3 of the second rear wall member 32b. The second surface connecting portion 42y connects the pair of second surface engaging portions 42x. More specifically, the second surface connecting portion 42y connects the rear ends of the pair of second surface extending portions 42x1.

[0048] When attaching the first rear wall member 32a and the second rear wall member 32b to the second surface joint member 42, the folded portion 32a3 of the first rear wall member 32a and the folded portion 32b3 of the second rear wall member 32b are fitted between the pair of second surface engaging portions 42x of the second surface joint member 42 (between the pair of second surface folded portions 42x2). The folded portion 32a3 of the first rear wall member 32a and the folded portion 32b3 of the second rear wall member 32b are fitted in such a way that they push apart the pair of second surface engaging portions 42x of the second surface joint member 42 (between the pair of second surface folded portions 42x2), thereby biasing them in opposite directions. When the folded portion 32a3 of the first rear wall member 32a and the folded portion 32b3 of the second rear wall member 32b are fitted together, the first rear wall member 32a and the second rear wall member 32b are fixed in the same plane via the second surface joint member 42.

[0049] Figure 5 is a cross-sectional view showing the area around the third surface joint member of the unit bath according to the first embodiment. As shown in Figure 5, the first left wall member 33a comprises a base material 33a1, a steel plate 33a2, and a folded portion 33a3. The steel plate 33a2 is provided to the right of the base material 33a1. The folded portion 33a3 is provided on the front and rear side surfaces of the steel plate 33a2 and includes a portion folded to the left and a portion folded to the right. The folded portion 33a3 is elastic. Similarly, the second left wall member 33b comprises a base material 33b1, a steel plate 33b2, and a folded portion 33b3. The steel plate 33b2 is provided to the right of the base material 33b1. The folded portion 33b3 is provided on the front and rear side surfaces of the steel plate 33b2 and includes a portion folded to the left and a portion folded to the right. The folded portion 33b3 is elastic.

[0050] The third-face joint member 43 has a pair of third-face engaging portions 43x and a third-face connecting portion 43y. Each of the pair of third-face engaging portions 43x has a third-face extending portion 43x1 and a third-face folded portion 43x2. The third-face extending portion 43x1 extends in the left-right direction. The third-face folded portion 43x2 is folded back from the right end of the third-face extending portion 43x1 toward the left. The third-face folded portion 43x2 is elastic. The pair of third-face engaging portions 43x engage with a plurality of left-side wall members 33. In the unit bath 100, one of the pair of third-face engaging portions 43x engages with the first left-side wall member 33a, and the other of the pair of third-face engaging portions 43x engages with the second left-side wall member 33b. More specifically, one of the pair of third-surface engaging portions 43x2 engages with the folded portion 33a3 of the first left wall member 33a, and the other of the pair of third-surface engaging portions 43x2 engages with the folded portion 33b3 of the second left wall member 33b. The third-surface connecting portion 43y connects the pair of third-surface engaging portions 43x. More specifically, the third-surface connecting portion 43y connects the left ends of the pair of third-surface extending portions 43x1.

[0051] When attaching the first left wall member 33a and the second left wall member 33b to the third surface joint member 43, the folded portion 33a3 of the first left wall member 33a and the folded portion 33b3 of the second left wall member 33b are fitted between the pair of third surface engaging portions 43x of the third surface joint member 43 (between the pair of third surface folded portions 43x2). The folded portion 33a3 of the first left wall member 33a and the folded portion 33b3 of the second left wall member 33b are fitted together in such a way that they push apart the pair of third surface engaging portions 43x of the third surface joint member 43 (between the pair of third surface folded portions 43x2), thereby biasing them in opposite directions. When the folded portion 33a3 of the first left wall member 33a and the folded portion 33b3 of the second left wall member 33b are fitted together, the first left wall member 33a and the second left wall member 33b are fixed in the same plane via the third surface joint member 43.

[0052] Figure 6 is a cross-sectional view showing the area around the fourth surface joint member of the unit bath according to the first embodiment. As shown in Figure 6, the first right wall member 34a comprises a base material 34a1, a steel plate 34a2, and a folded portion 34a3. The steel plate 34a2 is provided to the left of the base material 34a1. The folded portion 34a3 is provided on the front and rear side surfaces of the steel plate 34a2 and includes a portion folded to the right and a portion folded to the left. The folded portion 34a3 is elastic. Similarly, the second right wall member 34b comprises a base material 34b1, a steel plate 34b2, and a folded portion 34b3. The steel plate 34b2 is provided to the left of the base material 34b1. The folded portion 34b3 is provided on the front and rear side surfaces of the steel plate 34b2 and includes a portion folded to the right and a portion folded to the left. The folded portion 34b3 is elastic.

[0053] The fourth-face joint member 44 has a pair of fourth-face engaging portions 44x and a fourth-face connecting portion 44y. Each of the pair of fourth-face engaging portions 44x has a fourth-face extending portion 44x1 and a fourth-face folded portion 44x2. The fourth-face extending portion 44x1 extends in the left-right direction. The fourth-face folded portion 44x2 is folded back from the left end of the fourth-face extending portion 44x1 toward the right. The fourth-face folded portion 44x2 is elastic. The pair of fourth-face engaging portions 44x engage with a plurality of right-side wall members 34. In the unit bath 100, one of the pair of fourth-face engaging portions 44x engages with the first right-side wall member 34a, and the other of the pair of fourth-face engaging portions 44x engages with the second right-side wall member 34b. More specifically, one of the pair of fourth-face engagement portions 44x2 engages with the folded portion 34a3 of the first right wall member 34a, and the other of the pair of fourth-face engagement portions 44x2 engages with the folded portion 34b3 of the second right wall member 34b. The fourth-face connecting portion 44y connects the pair of fourth-face engagement portions 44x. More specifically, the fourth-face connecting portion 44y connects the right ends of the pair of fourth-face extension portions 44x1.

[0054] When attaching the first right wall member 34a and the second right wall member 34b to the fourth face joint member 44, the folded portion 34a3 of the first right wall member 34a and the folded portion 34b3 of the second right wall member 34b are fitted between the pair of fourth face engaging portions 44x of the fourth face joint member 44 (between the pair of fourth face folded portions 44x2). The folded portion 34a3 of the first right wall member 34a and the folded portion 34b3 of the second right wall member 34b are fitted together in such a way that they push apart the pair of fourth face engaging portions 44x of the fourth face joint member 44 (between the pair of fourth face folded portions 44x2), thereby biasing them in opposite directions. When the folded portion 34a3 of the first right wall member 34a and the folded portion 34b3 of the second right wall member 34b are fitted together, the first right wall member 34a and the second right wall member 34b are fixed in the same plane via the fourth surface joint member 44.

[0055] Figure 7 is a cross-sectional view showing the area around the first corner joint member of the unit bath according to the first embodiment. As shown in Figure 7, the first corner joint member 51 has a first corner engaging portion 51x, a second corner engaging portion 51y, and a first corner connecting portion 51z. The first corner engaging portion 51x has a first corner extending portion 51x1 and a first corner folded portion 51x2. The first corner extending portion 51x1 extends in the front-rear direction. The first corner folded portion 51x2 is folded forward from the rear end of the first corner extending portion 51x1. The first corner folded portion 51x2 is elastic. The first corner engaging portion 51x engages with one of the multiple front wall members 31. In the unit bath 100, the first corner engaging portion 51x engages with the first front wall member 31a. More specifically, the first corner folded portion 51x2 of the first corner engaging portion 51x engages with the folded portion 31a3 of the first front wall member 31a. The second corner engaging portion 51y has a second corner extending portion 51y1 and a second corner folded portion 51y2. The second corner extending portion 51y1 extends in the left-right direction. The second corner folded portion 51y2 is folded back from the right end of the second corner extending portion 51y1 toward the left. The second corner folded portion 51y2 is elastic. The second corner engaging portion 51y engages with one of the multiple left-side wall members 33. In the unit bath 100, the second corner engaging portion 51y engages with the first left-side wall member 33a. More specifically, the second corner folded portion 51y2 of the second corner engaging portion 51y engages with the folded portion 33a3 of the first left wall member 33a. The first corner connecting portion 51z connects the first corner engaging portion 51x and the second corner engaging portion 51y. More specifically, the first corner connecting portion 51z connects the front end of the first corner engaging portion 51x and the left end of the second corner engaging portion 51y.

[0056] When attaching the first front wall member 31a and the first left wall member 33a to the first corner joint member 51, the folded portion 31a3 of the first front wall member 31a and the folded portion 33a3 of the first left wall member 33a are fitted into the space between the first corner engaging portion 51x and the second corner engaging portion 51y of the first corner joint member 51 (between the first corner folded portion 51x2 and the second corner folded portion 51y2). The folded portion 31a3 of the first front wall member 31a and the folded portion 33a3 of the first left wall member 33a are fitted into the space between the first corner engaging portion 51x and the second corner engaging portion 51y of the first corner joint member 51 (between the first corner folded portion 51x2 and the second corner folded portion 51y2) in such a way that they are pushed apart and biased in each other's directions. When the folded portion 31a3 of the first front wall member 31a and the folded portion 33a3 of the first left wall member 33a are fitted together, the first front wall member 31a and the first left wall member 33a are fixed in a state where they are perpendicular to each other via the first corner joint member 51.

[0057] Figure 8 is a cross-sectional view showing the area around the second corner joint member of the unit bath according to the first embodiment. As shown in Figure 8, the second corner joint member 52 has a third corner engaging portion 52x, a fourth corner engaging portion 52y, and a second corner connecting portion 52z. The third corner engaging portion 52x has a third corner extending portion 52x1 and a third corner folded portion 52x2. The third corner extending portion 52x1 extends in the front-rear direction. The third corner folded portion 52x2 is folded forward from the rear end of the third corner extending portion 52x1. The third corner folded portion 52x2 is elastic. The third corner engaging portion 52x engages with one of the multiple front wall members 31. In the unit bath 100, the third corner engaging portion 52x engages with the second front wall member 31b. More specifically, the third corner folded portion 52x2 of the third corner engaging portion 52x engages with the folded portion 31b3 of the second front wall member 31b. The fourth corner engaging portion 52y has a fourth corner extending portion 52y1 and a fourth corner folded portion 52y2. The fourth corner extending portion 52y1 extends in the left-right direction. The fourth corner folded portion 52y2 is folded back from the left end of the fourth corner extending portion 52y1 toward the right. The fourth corner folded portion 52y2 is elastic. The fourth corner engaging portion 52y engages with one of the multiple right-side wall members 34. In the unit bath 100, the fourth corner engaging portion 52y engages with the first right-side wall member 34a. More specifically, the fourth corner folded portion 52y2 of the fourth corner engaging portion 52y engages with the folded portion 34a3 of the first right wall member 34a. The second corner connecting portion 52z connects the third corner engaging portion 52x and the fourth corner engaging portion 52y. More specifically, the second corner connecting portion 52z connects the front end of the third corner engaging portion 52x and the right end of the fourth corner engaging portion 52y.

[0058] When attaching the second front wall member 31b and the first right wall member 34a to the second corner joint member 52, the folded portion 31b3 of the second front wall member 31b and the folded portion 34a3 of the first right wall member 34a are fitted into the space between the third corner engaging portion 52x and the fourth corner engaging portion 52y of the second corner joint member 52 (between the third corner folded portion 52x2 and the fourth corner folded portion 52y2). The folded portion 31b3 of the second front wall member 31b and the folded portion 34a3 of the first right wall member 34a are fitted into the space between the third corner engaging portion 52x and the fourth corner engaging portion 52y of the second corner joint member 52 (between the third corner folded portion 52x2 and the fourth corner folded portion 52y2) in a manner that pushes them apart, thereby biasing them in opposite directions. When the folded portion 31b3 of the second front wall member 31b and the folded portion 34a3 of the first right wall member 34a are fitted together, the second front wall member 31b and the first right wall member 34a are fixed in a perpendicular position via the second corner joint member 52.

[0059] Figure 9 is a cross-sectional view showing the area around the third corner joint member of the unit bath according to the first embodiment. As shown in Figure 9, the third corner joint member 53 has a fifth corner engaging portion 53x, a sixth corner engaging portion 53y, and a third corner connecting portion 53z. The fifth corner engaging portion 53x has a fifth corner extending portion 53x1 and a fifth corner folded portion 53x2. The fifth corner extending portion 53x1 extends in the front-rear direction. The fifth corner folded portion 53x2 is folded back from the front end of the fifth corner extending portion 53x1 toward the rear. The fifth corner folded portion 53x2 is elastic. The fifth corner engaging portion 53x engages with one of the multiple rear wall members 32. In the unit bath 100, the fifth corner engaging portion 53x engages with the first rear wall member 32a. More specifically, the fifth corner folded portion 53x2 of the fifth corner engaging portion 53x engages with the folded portion 32a3 of the first rear wall member 32a. The sixth corner engaging portion 53y has a sixth corner extending portion 53y1 and a sixth corner folded portion 53y2. The sixth corner extending portion 53y1 extends in the left-right direction. The sixth corner folded portion 53y2 is folded back from the right end of the sixth corner extending portion 53y1 toward the left. The sixth corner folded portion 53y2 is elastic. The sixth corner engaging portion 53y engages with one of the multiple left-side wall members 33. In the unit bath 100, the sixth corner engaging portion 53y engages with the second left-side wall member 33b. More specifically, the hexagonal folded portion 53y2 of the hexagonal engaging portion 53y engages with the folded portion 33b3 of the second left wall member 33b. The third corner connecting portion 53z connects the 5th corner engaging portion 53x and the hexagonal engaging portion 53y. More specifically, the third corner connecting portion 53z connects the rear end of the 5th corner engaging portion 53x and the left end of the hexagonal engaging portion 53y.

[0060] When attaching the first rear wall member 32a and the second left wall member 33b to the third corner joint member 53, the folded portion 32a3 of the first rear wall member 32a and the folded portion 33b3 of the second left wall member 33b are fitted into the space between the fifth corner engaging portion 53x and the sixth corner engaging portion 53y of the third corner joint member 53 (between the fifth corner folded portion 53x2 and the sixth corner folded portion 53y2). The folded portion 32a3 of the first rear wall member 32a and the folded portion 33b3 of the second left wall member 33b are fitted into the space between the fifth corner engaging portion 53x and the sixth corner engaging portion 53y of the third corner joint member 53 (between the fifth corner folded portion 53x2 and the sixth corner folded portion 53y2) in a manner that pushes them apart, thereby biasing them in opposite directions. When the folded portion 32a3 of the first rear wall member 32a and the folded portion 33b3 of the second left wall member 33b are fitted together, the first rear wall member 32a and the second left wall member 33b are fixed in a perpendicular position via the third corner joint member 53.

[0061] Figure 10 is a cross-sectional view showing the area around the fourth corner joint member of the unit bath according to the first embodiment. As shown in Figure 10, the fourth corner joint member 54 has a seventh corner engaging portion 54x, an eighth corner engaging portion 54y, and a fourth corner connecting portion 54z. The seventh corner engaging portion 54x has a seventh corner extending portion 54x1 and a seventh corner folded portion 54x2. The seventh corner extending portion 54x1 extends in the front-rear direction. The seventh corner folded portion 54x2 is folded back from the front end of the seventh corner extending portion 54x1 toward the rear. The seventh corner folded portion 54x2 is elastic. The seventh corner engaging portion 54x engages with one of the multiple rear wall members 32. In the unit bath 100, the seventh corner engaging portion 54x engages with the third rear wall member 32b. More specifically, the seventh corner folded portion 54x2 of the seventh corner engaging portion 54x engages with the folded portion 32b3 of the second rear wall member 32b. The eighth corner engaging portion 54y has an eighth corner extending portion 54y1 and an eighth corner folded portion 54y2. The eighth corner extending portion 54y1 extends in the left-right direction. The eighth corner folded portion 54y2 is folded back from the left end of the eighth corner extending portion 54y1 toward the right. The eighth corner folded portion 54y2 is elastic. The eighth corner engaging portion 54y engages with one of the multiple right-side wall members 34. In the unit bath 100, the eighth corner engaging portion 54y engages with the second right-side wall member 34b. More specifically, the eighth-corner folded portion 54y2 of the eighth-corner engaging portion 54y engages with the folded portion 34b3 of the second right wall member 34b. The fourth-corner connecting portion 54z connects the seventh-corner engaging portion 54x and the eighth-corner engaging portion 54y. More specifically, the fourth-corner connecting portion 54z connects the rear end of the seventh-corner engaging portion 54x and the right end of the eighth-corner engaging portion 54y.

[0062] When attaching the second rear wall member 32b and the second right wall member 34b to the fourth corner joint member 54, the folded portion 32b3 of the second rear wall member 32b and the folded portion 34b3 of the second right wall member 34b are fitted into the space between the seventh corner engaging portion 54x and the eighth corner engaging portion 54y of the fourth corner joint member 54 (between the seventh corner folded portion 54x2 and the eighth corner folded portion 54y2). The folded portion 32b3 of the second rear wall member 32b and the folded portion 34b3 of the second right wall member 34b are fitted into the space between the seventh corner engaging portion 54x and the eighth corner engaging portion 54y of the fourth corner joint member 54 (between the seventh corner folded portion 54x2 and the eighth corner folded portion 54y2) in a manner that pushes them apart, thereby biasing them in each other's directions. When the folded portion 32b3 of the second rear wall member 32b and the folded portion 34b3 of the second right wall member 34b are fitted together, the second rear wall member 32b and the second right wall member 34b are fixed in a perpendicular position via the fourth corner joint member 54.

[0063] The lengths of each part will be explained below. Length L1 is the length in the front-to-back direction of the pair of first surface engagement portions 41x (first surface extension portion 41x1). Length L2 is the length in the front-to-back direction of the pair of second surface engagement portions 42x (second surface extension portion 42x1). Length L3 is the length in the left-to-right direction of the pair of third surface engagement portions 43x (third surface extension portion 43x1). Length L4 is the length in the left-to-right direction of the pair of fourth surface engagement portions 44x (fourth surface extension portion 44x1). Length L5a is the length in the front-to-back direction of the first corner engagement portion 51x (first corner extension portion 51x1). Length L5b is the length in the left-to-right direction of the second corner engagement portion 51y (second corner extension portion 51y1). Length L6a is the length in the front-to-back direction of the third corner engagement portion 52x (third corner extension portion 52x1). Length L6b is the length of the fourth corner engagement portion 52y (fourth corner extension portion 52y1) in the left-right direction. Length L7a is the length of the fifth corner engagement portion 53x (fifth corner extension portion 53x1) in the front-back direction. Length L7b is the length of the sixth corner engagement portion 53y (sixth corner extension portion 53y1) in the left-right direction. Length L8a is the length of the seventh corner engagement portion 54x (seventh corner extension portion 54x1) in the front-back direction. Length L8b is the length of the eighth corner engagement portion 54y (eighth corner extension portion 54y1) in the left-right direction.

[0064] In the unit bath 100, length L1 is smaller than at least one of lengths L3 and L4. Preferably, length L1 is smaller than lengths L3 and L4. In the unit bath 100, lengths L2, L3, and L4 are the same. In other words, in the unit bath 100, length L1 is smaller than lengths L2, L3, and L4. Thus, in the unit bath 100, the first surface joint member 41 is a joint member with a small depth, and the second surface joint member 42, the third surface joint member 43, and the fourth surface joint member 44 are joint members with a large depth.

[0065] In the unit bath 100, lengths L5a, L6a, L7a, and L8a are smaller than at least one of lengths L3 and L4. Preferably, lengths L5a, L6a, L7a, and L8a are smaller than lengths L3 and L4. In the unit bath 100, lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b are the same. Also, in the unit bath 100, lengths L2, L3, and L4 are the same. In other words, in the unit bath 100, lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b are smaller than lengths L2, L3, and L4. Furthermore, in the unit bath 100, lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b are the same as length L1. Lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b may be greater than or less than length L1. Thus, in the unit bath 100, the first corner joint member 51, the second corner joint member 52, the third corner joint member 53, and the fourth corner joint member 54 are joint members with a small depth.

[0066] (Modified version of the first embodiment) Figure 11 is a cross-sectional view showing a modified example of the first surface joint member of the unit bath according to the first embodiment. As shown in Figure 11, a reinforcing member 48 may be attached to the first surface joint member 41. The reinforcing member 48 has a pair of reinforcing extensions 48x and a reinforcing connection 48y. The pair of reinforcing extensions 48x extend in the front-rear direction. The pair of reinforcing extensions 48x are, for example, along a pair of first surface extensions 41x1 of the first surface joint member 41. The reinforcing connection 48y connects the pair of reinforcing extensions 48x together. More specifically, the reinforcing connection 48y connects the front ends of the pair of reinforcing extensions 48x together. The reinforcing connection 48y is, for example, along the first surface connection 41y of the first surface joint member 41. The reinforcing connection 48y is, for example, in contact with the first surface connection 41y of the first surface joint member 41.

[0067] The attachment of the reinforcing member 48 improves the connection strength of the first surface joint member 41. The reinforcing member 48 can be provided as needed and is optional.

[0068] The following describes the effects and advantages of the unit bathroom according to the first embodiment.

[0069] Since the multiple left wall members 33 and the multiple right wall members 34 include wall members whose vertical length is greater than that of the multiple front wall members 31, the connection strength tends to be lower compared to the front wall members 31. Therefore, reducing the depth of the joint members connecting the multiple left wall members 33 and the multiple right wall members 34 tends to lower the connection strength.

[0070] In contrast, in the unit bath 100 according to the first embodiment, the length L1 in the front-rear direction of the pair of first surface engagement parts 41x is smaller than at least one of the length L3 in the left-right direction of the pair of third surface engagement parts 43x and the length L4 in the left-right direction of the pair of fourth surface engagement parts 44x. As a result, a joint member with a small depth can be placed on the front wall member 31, which has a small vertical length and is therefore less prone to reduced connection strength, while a joint member with a large depth can be placed on the left wall member 33 and the right wall member 34, which have a large vertical length and are therefore prone to reduced connection strength. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0071] Furthermore, in the unit bath 100 according to the first embodiment, the length L1 in the front-to-back direction of the pair of first surface engagement portions 41x is smaller than the length L3 in the left-to-right direction of the pair of third surface engagement portions 43x and the length L4 in the left-to-right direction of the pair of fourth surface engagement portions 44x. As a result, joint members with a small depth can be placed on the front wall member, where the vertical length is small and the connection strength is less likely to be reduced, while joint members with a large depth can be placed on the left and right wall members, where the vertical length is large and the connection strength is more likely to be reduced. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0072] Furthermore, in the unit bath 100 according to the first embodiment, the length L5a in the front-rear direction of the first corner engaging portion 51x, the length L6a in the front-rear direction of the third corner engaging portion 52x, the length L7a in the front-rear direction of the fifth corner engaging portion 53x, and the length L8a in the front-rear direction of the seventh corner engaging portion 54x are smaller than at least one of the length L3 in the left-right direction of the pair of third surface engaging portions 43x and the length L4 in the left-right direction of the pair of fourth surface engaging portions 44x. This allows for the placement of joint members with a small depth in the corners of the unit bath where moments are less likely to occur. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0073] (Second Embodiment) Figure 12 is a perspective view showing a unit bathroom according to the second embodiment. Figure 13 is a cross-sectional view showing a unit bathroom according to the second embodiment. As shown in Figures 12 and 13, the unit bath 100A according to the second embodiment is substantially the same as the unit bath 100 according to the first embodiment, except that it is different in size and the number of left wall members 33, right wall members 34, third-side joint members 43, and fourth-side joint members 44.

[0074] In unit bath 100A, the length in the front-to-back direction of unit bath 100A is greater than the length in the left-to-right direction of unit bath 100A. In unit bath 100A, the longitudinal direction of the bathtub 10 is aligned with the short direction (left-to-right direction) of unit bath 100A. Also, in unit bath 100A, the short direction of the bathtub 10 is aligned with the longitudinal direction (front-to-back direction) of unit bath 100A.

[0075] In the unit bathroom 100A, the left wall members 33 include a first left wall member 33a, a second left wall member 33b, and a third left wall member 33c. The first left wall member 33a is located in front of the second left wall member 33b. The third left wall member 33c is located behind the second left wall member 33b. In other words, the first left wall member 33a, the second left wall member 33b, and the third left wall member 33c are adjacent to each other in the front-to-back direction.

[0076] In the unit bathroom 100A, the multiple right wall members 34 include a first right wall member 34a, a second right wall member 34b, and a third right wall member 34c. The first right wall member 34a is located in front of the second right wall member 34b. The third right wall member 34c is located behind the second right wall member 34b. In other words, the first right wall member 34a, the second right wall member 34b, and the third right wall member 34c are adjacent to each other in the front-to-back direction. The first right wall member 34a faces the first left wall member 33a in the left-to-right direction. The second right wall member 34b faces the second left wall member 33b in the left-to-right direction. The third right wall member 34c faces the third left wall member 33c in the left-to-right direction.

[0077] In the unit bath 100A, the third-side joint member 43 comprises a third-side joint member 43a and a third-side joint member 43b. The third-side joint member 43a connects the first left wall member 33a and the second left wall member 33b. The third-side joint member 43b connects the second left wall member 33b and the third left wall member 33c. The third-side joint members 43a and 43b are positioned on the outside (left side) of the multiple left wall members 33.

[0078] In the unit bath 100A, the fourth-side joint member 44 comprises a fourth-side joint member 44a and a fourth-side joint member 44b. The fourth-side joint member 44a connects the first right-side wall member 34a and the second right-side wall member 34b. The fourth-side joint member 44b connects the second right-side wall member 34b and the third right-side wall member 34c. The fourth-side joint members 44a and 44b are positioned on the outside (right side) of the multiple right-side wall members 34.

[0079] In the unit bath 100A, the hexagonal engaging portion 53y of the third corner joint member 53 engages with the third left wall member 33c. More specifically, the hexagonal folded portion 53y2 of the hexagonal engaging portion 53y engages with the folded portion of the third left wall member 33c.

[0080] In the unit bath 100A, the eighth corner engaging portion 54y of the fourth corner joint member 54 engages with the third right wall member 34c. More specifically, the eighth corner folded portion 54y2 of the eighth corner engaging portion 54y engages with the folded portion of the third right wall member 34c.

[0081] The lengths of each part will be explained below. Lengths L1, L2, L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b are as described above. Length L3a is the left-right length of the pair of third surface engaging portions 43x (third surface extension portion 43x1) of the third surface joint member 43a. Length L3b is the left-right length of the pair of third surface engaging portions 43x (third surface extension portion 43x1) of the third surface joint member 43b. Length L4a is the left-right length of the pair of fourth surface engaging portions 44x (fourth surface extension portion 44x1) of the fourth surface joint member 44a. Length L4b is the left-right length of the pair of fourth surface engaging portions 44x (fourth surface extension portion 44x1) of the fourth surface joint member 44b.

[0082] In unit bath 100A, at least one of lengths L1 and L2 is smaller than at least one of lengths L3a, L3b, L4a, and L4b. It is preferable that lengths L1 and L2 are smaller than at least one of lengths L3a, L3b, L4a, and L4b. It is preferable that at least one of lengths L1 and L2 is smaller than lengths L3a, L3b, L4a, and L4b. In unit bath 100A, lengths L1 and L2 are the same. In unit bath 100A, lengths L3a, L3b, L4a, and L4b are the same. In other words, in unit bath 100A, lengths L1 and L2 are smaller than lengths L3a, L3b, L4a, and L4b.

[0083] In unit bath 100A, lengths L5a, L6a, L7a, and L8a are smaller than at least one of lengths L3a, L3b, L4a, and L4b. Preferably, lengths L5a, L6a, L7a, and L8a are smaller than lengths L3a, L3b, L4a, and L4b. In unit bath 100A, lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b are the same. Also, in unit bath 100A, lengths L3a, L3b, L4a, and L4b are the same. In other words, in unit bath 100A, lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b are smaller than lengths L3a, L3b, L4a, and L4b. Also, in unit bath 100A, lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b are the same as lengths L1 and L2. Lengths L5a, L5b, L6a, L6b, L7a, L7b, L8a, and L8b may be larger than lengths L1 and L2, or smaller than lengths L1 and L2.

[0084] In the example of the unit bath 100A, the case in which multiple left wall members 33 and multiple right wall members 34 each contain three wall members was used for the explanation. Multiple left wall members 33 and multiple right wall members 34 may each contain two wall members. In this case, the length of each wall member in the front-to-back direction is greater than the length of each wall member included in the multiple front wall members 31 and multiple rear wall members 32 in the left-to-right direction.

[0085] In unit bath 100A, the depths of the first and second surface joint members 41 and 42 are smaller than the depths of the third and fourth surface joint members 43 and 44. The depth of one of the first and second surface joint members 41 may be greater than the depth of the other. In this case, the depth of the other of the first and second surface joint members 41 may be the same as the depth of the third and fourth surface joint members 43 and 44.

[0086] In the unit bath 100A, a reinforcing member 48 may be attached to the joint member among the first joint member 41 and the second joint member 42 that has a depth smaller than the depth of the third joint member 43 and the fourth joint member 44. If the depth of the first joint member 41 and the second joint member 42 is smaller than the depth of the third joint member 43 and the fourth joint member 44, the reinforcing member 48 may be attached to both the first joint member 41 and the second joint member 42, or the reinforcing member 48 may be attached to only one of the first joint member 41 and the second joint member 42. If the reinforcing member 48 is attached to only one of the first joint member 41 and the second joint member 42, it is preferable that the reinforcing member 48 be attached to the second joint member 42, which tends to have lower connection strength than the first joint member 41.

[0087] The following describes the effects and advantages of the unit bathroom according to the second embodiment.

[0088] When there are three or more wall members (multiple left wall members 33 and multiple right wall members 34) along the longitudinal direction (front-to-back direction) of the unit bathroom, the connection strength tends to be low because there are wall members (for example, a second left wall member 33b and a second right wall member 34b) that are not connected to the corner joint member. Also, when the length in the front-to-back direction of each wall member included in the wall members (multiple left wall members 33 and multiple right wall members 34) along the longitudinal direction (front-to-back direction) of the unit bathroom is greater than the length in the left-to-right direction of each wall member included in the multiple front wall members 31 and multiple rear wall members 32, the moment becomes larger, which tends to lower the connection strength. Thus, the connection strength tends to be low at the connection points of wall members along the longitudinal direction of the unit bathroom. For this reason, reducing the depth of the joint member connecting the multiple left wall members 33 and multiple right wall members 34 tends to lower the connection strength.

[0089] In contrast, in the unit bath 100A according to the second embodiment, at least one of the front-to-back length L1 of the pair of first surface engagement parts 41x and the front-to-back length L2 of the pair of second surface engagement parts 42x is smaller than at least one of the left-to-right length L3 of the pair of third surface engagement parts 43x and the left-to-right length L4 of the pair of fourth surface engagement parts 44. As a result, joint members with a small depth can be placed on the front wall member 31 and the rear wall member 32, which are aligned with the shorter side of the unit bath 100A and are therefore less likely to have reduced connection strength, while joint members with a large depth can be placed on the left wall member 33 and the right wall member 34, which are aligned with the longer side of the unit bath 100A and are therefore more likely to have reduced connection strength. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0090] Furthermore, in the unit bath 100A according to the second embodiment, the length L1 in the front-rear direction of the pair of first surface engagement parts 41x and the length L2 in the front-rear direction of the pair of second surface engagement parts 42x are smaller than at least one of the length L3 in the left-right direction of the pair of third surface engagement parts 43x and the length L4 in the left-right direction of the pair of fourth surface engagement parts 44x. As a result, joint members with a small depth can be placed on the front wall member 31 and the rear wall member 32, which are aligned with the shorter direction of the unit bath 100A and therefore less likely to have reduced connection strength, while joint members with a large depth can be placed on the left wall member 33 and the right wall member 34, which are aligned with the longitudinal direction of the unit bath 100A and therefore more likely to have reduced connection strength. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0091] Furthermore, in the unit bath 100A according to the second embodiment, at least one of the front-to-back length L1 of the pair of first surface engagement parts 41x and the front-to-back length L2 of the pair of second surface engagement parts 42x is smaller than the left-to-right length L3 of the pair of third surface engagement parts 43x and the left-to-right length L4 of the pair of fourth surface engagement parts 44x. As a result, joint members with a small depth can be placed on the front wall member 31 and the rear wall member 32, which are aligned with the shorter side of the unit bath 100A and therefore less likely to have reduced connection strength, while joint members with a large depth can be placed on the left wall member 33 and the right wall member 34, which are aligned with the longer side of the unit bath 100A and therefore more likely to have reduced connection strength. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0092] Furthermore, in the unit bath 100A according to the second embodiment, the length L5a in the front-rear direction of the first corner engaging portion 51x, the length L6a in the front-rear direction of the third corner engaging portion 52x, the length L7a in the front-rear direction of the fifth corner engaging portion 53x, and the length L8a in the front-rear direction of the seventh corner engaging portion 54x are smaller than at least one of the length L3 in the left-right direction of the pair of third surface engaging portions 43x and the length L4 in the left-right direction of the pair of fourth surface engaging portions 44x. This allows for the placement of joint members with a small depth in the corners of the unit bath where moments are less likely to occur. This makes it possible to reduce the installation dimensions while providing sufficient connection strength in the necessary areas.

[0093] The embodiment may include the following configurations. (Composition 1) A bathtub whose length in the left-to-right direction is greater than its length in the front-to-back direction, A washing area floor is provided behind the aforementioned bathtub, A plurality of front wall members are provided above the front end of the bathtub and are arranged in the left-right direction, A plurality of rear wall members are provided on the rear end of the aforementioned washing area floor, arranged in the left-right direction, A plurality of left-side wall members are provided above the left end of the bathtub and above the left end of the washing area floor, arranged in the front-to-back direction, A plurality of right-side wall members are provided above the right end of the bathtub and above the right end of the washing area floor, arranged in the front-to-back direction, A first surface joint member that connects the plurality of front wall members, A second surface joint member connects the plurality of rear wall members, A third surface joint member that connects the plurality of left-side wall members, A fourth surface joint member that connects the plurality of right-side wall members, Equipped with, The first surface joint member has a pair of first surface engagement portions that extend in the front-rear direction and engage with the plurality of front wall members, and a first surface connecting portion that connects the pair of first surface engagement portions together. The second surface joint member has a pair of second surface engagement portions that extend in the front-rear direction and engage with the plurality of rear wall members, and a second surface connecting portion that connects the pair of second surface engagement portions together. The third surface joint member has a pair of third surface engaging portions that extend in the left-right direction and engage with the plurality of left-side wall members, and a third surface connecting portion that connects the pair of third surface engaging portions. The fourth surface joint member has a pair of fourth surface engaging portions that extend in the left-right direction and engage with the plurality of right-side wall members, and a fourth surface connecting portion that connects the pair of fourth surface engaging portions. A unit bath in which the length in the front-to-back direction of the pair of first surface engagement portions is smaller than at least one of the length in the left-to-right direction of the pair of third surface engagement portions and the length in the left-to-right direction of the pair of fourth surface engagement portions. (Configuration 2) The unit bath according to configuration 1, wherein the length of the pair of first surface engagement portions in the front-rear direction is smaller than the length of the pair of third surface engagement portions in the left-right direction and the length of the pair of fourth surface engagement portions in the left-right direction. (Composition 3) A unit bathroom in which the length in the front-to-back direction is greater than the length in the left-to-right direction, The unit bath is provided at the front end, and comprises a plurality of front wall members arranged in the left-right direction, A plurality of rear wall members are provided at the rear end of the aforementioned unit bath, arranged in the left-right direction, The unit bathroom is provided at the left end, and consists of a plurality of left-side wall members arranged in the front-to-back direction, The unit bathroom is provided at the right end, and consists of a plurality of right-side wall members arranged in the front-to-back direction, A first surface joint member that connects the plurality of front wall members, A second surface joint member connects the plurality of rear wall members, A third surface joint member that connects the plurality of left-side wall members, A fourth surface joint member that connects the plurality of right-side wall members, Equipped with, The first surface joint member has a pair of first surface engagement portions that extend in the front-rear direction and engage with the plurality of front wall members, and a first surface connecting portion that connects the pair of first surface engagement portions together. The second surface joint member has a pair of second surface engagement portions that extend in the front-rear direction and engage with the plurality of rear wall members, and a second surface connecting portion that connects the pair of second surface engagement portions together. The third surface joint member has a pair of third surface engaging portions that extend in the left-right direction and engage with the plurality of left-side wall members, and a third surface connecting portion that connects the pair of third surface engaging portions. The fourth surface joint member has a pair of fourth surface engaging portions that extend in the left-right direction and engage with the plurality of right-side wall members, and a fourth surface connecting portion that connects the pair of fourth surface engaging portions. A unit bathroom in which at least one of the lengths of the pair of first surface engagement portions in the front-to-back direction and the lengths of the pair of second surface engagement portions in the front-to-back direction is smaller than at least one of the lengths of the pair of third surface engagement portions in the left-to-right direction and the lengths of the pair of fourth surface engagement portions in the left-to-right direction. (Composition 4) The unit bath according to configuration 3, wherein the length of the pair of first surface engagement portions in the front-rear direction and the length of the pair of second surface engagement portions in the front-rear direction are smaller than at least one of the length of the pair of third surface engagement portions in the left-right direction and the length of the pair of fourth surface engagement portions in the left-right direction. (Composition 5) The unit bath according to configuration 3 or 4, wherein at least one of the lengths of the pair of first surface engagement portions in the front-rear direction and the lengths of the pair of second surface engagement portions in the front-rear direction is smaller than the lengths of the pair of third surface engagement portions in the left-right direction and the lengths of the pair of fourth surface engagement portions in the left-right direction. (Composition 6) A first corner joint member connecting one of the plurality of front wall members and one of the plurality of left wall members, A second corner joint member connects one of the plurality of front wall members and one of the plurality of right wall members, A third corner joint member connecting one of the plurality of rear wall members and one of the plurality of left wall members, A fourth corner joint member connects one of the plurality of rear wall members and one of the plurality of right wall members, Furthermore, The first corner joint member has a first corner engaging portion that extends in the front-rear direction and engages with one of the plurality of front wall members, a second corner engaging portion that extends in the left-right direction and engages with one of the plurality of left wall members, and a first corner connecting portion that connects the first corner engaging portion and the second corner engaging portion. The second corner joint member has a third corner engaging portion that extends in the front-rear direction and engages with one of the plurality of front wall members, a fourth corner engaging portion that extends in the left-right direction and engages with one of the plurality of right wall members, and a second corner connecting portion that connects the third corner engaging portion and the fourth corner engaging portion. The third corner joint member has a fifth corner engaging portion that extends in the front-rear direction and engages with one of the plurality of rear wall members, a sixth corner engaging portion that extends in the left-right direction and engages with one of the plurality of left wall members, and a third corner connecting portion that connects the fifth corner engaging portion and the sixth corner engaging portion. The fourth corner joint member has a seventh corner engaging portion that extends in the front-rear direction and engages with one of the plurality of rear wall members, an eighth corner engaging portion that extends in the left-right direction and engages with one of the plurality of right-side wall members, and a fourth corner connecting portion that connects the seventh corner engaging portion and the eighth corner engaging portion. The unit bath according to any one of configurations 1 to 5, wherein the length in the front-rear direction of the first corner engagement portion, the length in the front-rear direction of the third corner engagement portion, the length in the front-rear direction of the fifth corner engagement portion, and the length in the front-rear direction of the seventh corner engagement portion are smaller than at least one of the lengths in the left-right direction of the pair of third surface engagement portions and the lengths in the left-right direction of the pair of fourth surface engagement portions.

[0094] As described above, according to the embodiment, a unit bathroom is provided that can reduce the installation dimensions while providing sufficient connection strength in the necessary parts.

[0095] Embodiments of the present invention have been described above. However, the present invention is not limited to these descriptions. Modifications made by those skilled in the art to the above-described embodiments are also included within the scope of the present invention, as long as they retain the features of the present invention. For example, the shape, dimensions, materials, and arrangement of each element of a unit bath, etc., are not limited to those exemplified and can be modified as appropriate. Furthermore, the elements of each of the embodiments described above can be combined to the extent technically possible, and these combinations are also included within the scope of the present invention insofar as they include the features of the present invention. [Explanation of Symbols]

[0096] 10: Bathtub 20: Washing area floor 31: Front wall member 31a: First front wall member 31a1: Base material 31a2: Steel plate 31a3: Folded portion 31b: Second front wall member 31b1: Base material 31b2: Steel plate 31b3: Folded portion 32: Rear wall member 32a: First rear wall member 32a1: Base material 32a2: Steel plate 32a3: Folded portion 32b: Second rear wall member 32b1: Base material 32b2: Steel plate 32b3: Folded portion 33:Left wall member 33a: 1st left wall member 33a1: Base material 33a2: Steel plate 33a3: Folded portion 33b: 2nd left wall member 33b1: Base material 33b2: Steel plate 33b3: Folded portion 34: Right wall member 34a: 1st right wall member 34a1: Base material 34a2: Steel plate 34a3: Folded portion 34b: 2nd right wall member 34b1: Base material 34b2: Steel plate 34b3: Folded portion 41: First surface joint member 41x: First surface engagement part 41x1: First side extension part 41x2: Fold-over portion of the first side 41y: First surface connection 42: Second surface joint member 42x: 2nd surface engagement part 42x1: 2nd side extension part 42x2: Fold-over portion of the second side 42y: Second surface connection 43, 43a, 43b: Third surface joint member 43x: Third surface engagement part 43x1: Third side extension part 43x2: Folded section of the third panel 43y: Third surface connection 44, 44a, 44b: Fourth-face joint member 44x: 4th surface engagement part 44x1: 4th side extension part 44x2: Folded section of the fourth panel 44y: Fourth surface connection 48: Reinforcement member 48x: Reinforcement extension 48y: Reinforcement connection 51: First corner joint member 51x: 1st corner engagement part 51x1: 1st corner extension part 51x2: First corner fold 51y: 2nd corner engagement part 51y1: 2nd corner extension part 51y2: Second corner turn 51z: First corner connection 52: Second corner joint member 52x: Third corner engagement part 52x1: 3rd corner extension part 52x2: Third corner folded section 52y: Fourth corner engagement section 52y1: 4th corner extension part 52y2: Fourth corner turn 52z: Second corner connection 53: Third corner joint member 53x: 5th corner engagement part 53x1: 5th corner extension part 53x2: Fifth corner folded section 53y: 6th corner engagement part 53y1: 6th corner extension part 53y2: Sixth corner turn 53z: Third corner connection 54: Fourth corner joint member 54x: 7th corner engagement part 54x1: 7th corner extension part 54x2: Folded section at the 7th corner 54y: 8th corner engagement part 54y1: 8th corner extension part 54y2: 8th corner turn 54z: Fourth corner connection 61: First joint connecting material 62: Second joint connecting material 63: Third joint connecting material 64: Fourth joint connecting material 70: Ceiling material 100, 100A: Unit bathroom

Claims

1. A bathtub whose length in the left-to-right direction is greater than its length in the front-to-back direction, A washing area floor is provided behind the aforementioned bathtub, A plurality of front wall members are provided above the front end of the bathtub and are arranged in the left-right direction, A plurality of rear wall members are provided on the rear end of the aforementioned washing area floor, arranged in the left-right direction, A plurality of left-side wall members are provided above the left end of the bathtub and above the left end of the washing area floor, arranged in the front-to-back direction, A plurality of right-side wall members are provided above the right end of the bathtub and above the right end of the washing area floor, arranged in the front-to-back direction, A first surface joint member that connects the plurality of front wall members, A second surface joint member connects the plurality of rear wall members, A third surface joint member that connects the plurality of left-side wall members, A fourth surface joint member that connects the plurality of right-side wall members, Equipped with, The first surface joint member has a pair of first surface engagement portions that extend in the front-rear direction and engage with the plurality of front wall members, and a first surface connecting portion that connects the pair of first surface engagement portions together. The second surface joint member has a pair of second surface engaging portions that extend in the front-rear direction and engage with the plurality of rear wall members, and a second surface connecting portion that connects the pair of second surface engaging portions. The third surface joint member has a pair of third surface engaging portions that extend in the left-right direction and engage with the plurality of left-side wall members, and a third surface connecting portion that connects the pair of third surface engaging portions together. The fourth surface joint member has a pair of fourth surface engaging portions that extend in the left-right direction and engage with the plurality of right-side wall members, and a fourth surface connecting portion that connects the pair of fourth surface engaging portions together. A unit bath in which the length of the pair of first surface engagement portions in the front-to-back direction is smaller than at least one of the length of the pair of third surface engagement portions in the left-to-right direction and the length of the pair of fourth surface engagement portions in the left-to-right direction.

2. The unit bath according to claim 1, wherein the length of the pair of first surface engagement portions in the front-rear direction is smaller than the length of the pair of third surface engagement portions in the left-right direction and the length of the pair of fourth surface engagement portions in the left-right direction.

3. A unit bathroom in which the length in the front-to-back direction is greater than the length in the left-to-right direction, The unit bath is provided at the front end, and comprises a plurality of front wall members arranged in the left-right direction, A plurality of rear wall members are provided at the rear end of the aforementioned unit bath, arranged in the left-right direction, The unit bathroom is provided at the left end, and consists of a plurality of left-side wall members arranged in the front-to-back direction, The unit bathroom is provided at the right end, and consists of a plurality of right-side wall members arranged in the front-to-back direction, A first surface joint member that connects the plurality of front wall members, A second surface joint member connects the plurality of rear wall members, A third surface joint member that connects the plurality of left-side wall members, A fourth surface joint member that connects the plurality of right-side wall members, Equipped with, The first surface joint member has a pair of first surface engagement portions that extend in the front-rear direction and engage with the plurality of front wall members, and a first surface connecting portion that connects the pair of first surface engagement portions together. The second surface joint member has a pair of second surface engaging portions that extend in the front-rear direction and engage with the plurality of rear wall members, and a second surface connecting portion that connects the pair of second surface engaging portions. The third surface joint member has a pair of third surface engaging portions that extend in the left-right direction and engage with the plurality of left-side wall members, and a third surface connecting portion that connects the pair of third surface engaging portions together. The fourth surface joint member has a pair of fourth surface engaging portions that extend in the left-right direction and engage with the plurality of right-side wall members, and a fourth surface connecting portion that connects the pair of fourth surface engaging portions together. A unit bathroom in which at least one of the lengths of the pair of first surface engagement portions in the front-rear direction and the lengths of the pair of second surface engagement portions in the front-rear direction is smaller than at least one of the lengths of the pair of third surface engagement portions in the left-right direction and the lengths of the pair of fourth surface engagement portions in the left-right direction.

4. The unit bath according to claim 3, wherein the length of the pair of first surface engagement portions in the front-rear direction and the length of the pair of second surface engagement portions in the front-rear direction are smaller than at least one of the length of the pair of third surface engagement portions in the left-right direction and the length of the pair of fourth surface engagement portions in the left-right direction.

5. The unit bath according to claim 3, wherein at least one of the lengths of the pair of first surface engagement portions in the front-rear direction and the lengths of the pair of second surface engagement portions in the front-rear direction is smaller than the lengths of the pair of third surface engagement portions in the left-right direction and the lengths of the pair of fourth surface engagement portions in the left-right direction.

6. A first corner joint member connecting one of the plurality of front wall members and one of the plurality of left wall members, A second corner joint member connects one of the plurality of front wall members and one of the plurality of right wall members, A third corner joint member connects one of the plurality of rear wall members and one of the plurality of left wall members, A fourth corner joint member connecting one of the plurality of rear wall members and one of the plurality of right wall members, Furthermore, The first corner joint member has a first corner engaging portion that extends in the front-rear direction and engages with one of the plurality of front wall members, a second corner engaging portion that extends in the left-right direction and engages with one of the plurality of left wall members, and a first corner connecting portion that connects the first corner engaging portion and the second corner engaging portion. The second corner joint member has a third corner engaging portion that extends in the front-rear direction and engages with one of the plurality of front wall members, a fourth corner engaging portion that extends in the left-right direction and engages with one of the plurality of right wall members, and a second corner connecting portion that connects the third corner engaging portion and the fourth corner engaging portion. The third corner joint member has a fifth corner engaging portion that extends in the front-rear direction and engages with one of the plurality of rear wall members, a sixth corner engaging portion that extends in the left-right direction and engages with one of the plurality of left wall members, and a third corner connecting portion that connects the fifth corner engaging portion and the sixth corner engaging portion. The fourth corner joint member has a seventh corner engaging portion that extends in the front-rear direction and engages with one of the plurality of rear wall members, an eighth corner engaging portion that extends in the left-right direction and engages with one of the plurality of right wall members, and a fourth corner connecting portion that connects the seventh corner engaging portion and the eighth corner engaging portion. The unit bath according to any one of claims 1 to 5, wherein the length in the front-rear direction of the first corner engagement portion, the length in the front-rear direction of the third corner engagement portion, the length in the front-rear direction of the fifth corner engagement portion, and the length in the front-rear direction of the seventh corner engagement portion are smaller than at least one of the lengths in the left-right direction of the pair of third surface engagement portions and the lengths in the left-right direction of the pair of fourth surface engagement portions.

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