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A box-shaped ready-to-assemble toilet is made of corrugated board or cardboard. The ready-to-assemble toilet includes first to fourth sidewall portions and a bottom portion. Each of the first to fourth sidewall portions includes an outer sidewall, an inner sidewall and a horizontal wall. The horizon

A box-shaped ready-to-assemble toilet is made of corrugated board or cardboard. The ready-to-assemble toilet includes first to fourth sidewall portions and a bottom portion. Each of the first to fourth sidewall portions includes an outer sidewall, an inner sidewall and a horizontal wall. The horizontal walls of the first and second sidewall portions overlap each other. The horizontal walls of the second and third sidewall portions overlap each other. The horizontal walls of the third and fourth sidewall portions overlap each other. The horizontal walls of the fourth and first sidewall portions overlap each other.

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1. A ready-to-assemble toilet made of corrugated board or cardboard and being box-shaped, comprising: a first sidewall portion, a second sidewall portion adjacent to the first sidewall portion, a third sidewall portion adjacent to the second sidewall portion, a fourth sidewall portion adjacent to th

1. A ready-to-assemble toilet made of corrugated board or cardboard and being box-shaped, comprising: a first sidewall portion, a second sidewall portion adjacent to the first sidewall portion, a third sidewall portion adjacent to the second sidewall portion, a fourth sidewall portion adjacent to the third sidewall portion, and a bottom portion,wherein each of the first to fourth sidewall portions includes an outer sidewall, an inner sidewall facing the outer sidewall, and a horizontal wall connecting an upper end of the outer sidewall and an upper end of the inner sidewall,the horizontal wall of the first sidewall portion and the horizontal wall of the second sidewall portion overlap each other,the horizontal wall of the second sidewall portion and the horizontal wall of the third sidewall portion overlap each other,the horizontal wall of the third sidewall portion and the horizontal wall of the fourth sidewall portion overlap each other,the horizontal wall of the fourth sidewall portion and the horizontal wall of the first sidewall portion overlap each other,one sidewall portion of the first and second sidewall portions has a first slit formed from the horizontal wall to the inner sidewall, andthe horizontal wall of the other sidewall portion of the first and second sidewall portions overlies the horizontal wall of the one sidewall portion of the first and second sidewall portions by inserting the inner sidewall of the other sidewall portion of the first and second sidewall portions into the first slit. 2. The ready-to-assemble toilet according to claim 1, wherein the first slit is formed from the horizontal wall to a middle of the inner sidewall in the one sidewall portion of the first and second sidewall portions,the inner sidewall of the other sidewall portion of the first and second sidewall portions has a first cut extending from a lower end of the inner sidewall, andthe first cut is engaged with a part of the inner sidewall of the one sidewall portion of the first and second sidewall portions, the part being on an extension line of the first slit. 3. The ready-to-assemble toilet according to claim 1, wherein one sidewall portion of the second and third sidewall portions has a second slit formed from the horizontal wall to the inner sidewall, andthe horizontal wall of the other sidewall portion of the second and third sidewall portions overlies the horizontal wall of the one sidewall portion of the second and third sidewall portions by inserting the inner sidewall of the other sidewall portion of the second and third sidewall portions into the second slit. 4. The ready-to-assemble toilet according to claim 3, wherein the second slit is formed from the horizontal wall to a middle of the inner sidewall in the one sidewall portion of the second and third sidewall portions,the inner sidewall of the other sidewall portion of the second and third sidewall portions has a second cut extending from a lower end of the inner sidewall, andthe second cut is engaged with a part of the inner sidewall of the one sidewall portion of the second and third sidewall portions, the part being on an extension line of the second slit. 5. The ready-to-assemble toilet according to claim 3, wherein one sidewall portion of the third and fourth sidewall portions has a third slit formed from the horizontal wall to the inner sidewall, andthe horizontal wall of the other sidewall portion of the third and fourth sidewall portions overlies the horizontal wall of the one sidewall portion of the third and fourth sidewall portions by inserting the inner sidewall of the other sidewall portion of the third and fourth sidewall portions into the third slit. 6. The ready-to-assemble toilet according to claim 5, wherein the third slit is formed from the horizontal wall to a middle of the inner sidewall in the one sidewall portion of the third and fourth sidewall portions,the inner sidewall of the other sidewall portion of the third and fourth sidewall portions has a third cut extending from a lower end of the inner sidewall, andthe third cut is engaged with a part of the inner sidewall of the one sidewall portion of the third and fourth sidewall portions, the part being on an extension line of the third slit. 7. The ready-to-assemble toilet according to claim 5, wherein one sidewall portion of the fourth and first sidewall portions has a fourth slit formed from the horizontal wall to the inner sidewall, andthe horizontal wall of the other sidewall portion of the fourth and first sidewall portions overlies the horizontal wall of the one sidewall portion of the fourth and first sidewall portions by inserting the inner sidewall of the other sidewall portion of the fourth and first sidewall portions into the fourth slit. 8. The ready-to-assemble toilet according to claim 7, wherein the fourth slit is formed from the horizontal wall to a middle of the inner sidewall in the one sidewall portion of the fourth and first sidewall portions,the inner sidewall of the other sidewall portion of the fourth and first sidewall portions has a fourth cut extending from a lower end of the inner sidewall, andthe fourth cut is engaged with a part of the inner sidewall of the one sidewall portion of the fourth and first sidewall portions, the part being on an extension line of the fourth slit. 9. The ready-to-assemble toilet according to claim 7, wherein the first slit is formed in the second sidewall portion,the fourth slit is formed in the fourth sidewall portion, andthe horizontal wall of the first sidewall portion overlies the horizontal walls of the second and fourth sidewall portions by inserting the inner sidewall of the first sidewall portion into the first and fourth slits. 10. The ready-to-assemble toilet according to claim 9, wherein a vertical length of the inner sidewall of the first sidewall portion is smaller than a vertical length of the outer sidewall of the first sidewall portion. 11. The ready-to-assemble toilet according to claim 10, wherein the first sidewall portion includes an auxiliary piece extending from a lower end of the inner sidewall of the first sidewall portion to the bottom portion. 12. The ready-to-assemble toilet according to claim 9, wherein the second slit is formed in the second sidewall portion,the third slit is formed in the fourth sidewall portion, andthe horizontal wall of the third sidewall portion overlies the horizontal walls of the second and fourth sidewall portions by inserting the inner sidewall of the third sidewall portion into the second and third slits. 13. The ready-to-assemble toilet according to claim 12, wherein a vertical length of the inner sidewall of the third sidewall portion is smaller than a vertical length of the outer sidewall of the third sidewall portion. 14. The ready-to-assemble toilet according to claim 13, wherein the third sidewall portion includes an auxiliary piece extending from a lower end of the inner sidewall of the third sidewall portion to the bottom portion. 15. The ready-to-assemble toilet according to claim 1, wherein the horizontal walls of the first to fourth sidewall portions function as a toilet seat. 16. The ready-to-assemble toilet according to claim 1, wherein each of the first to fourth sidewall portions is formed of a single sheet of corrugated board or cardboard having a plurality of folding lines, and is configured such that the outer sidewall, the inner sidewall and the horizontal wall are formed by folding along the folding lines. 17. The ready-to-assemble toilet according to claim 1, wherein the ready-to-assemble toilet is formed of a single sheet of flat corrugated board or cardboard. 18. The ready-to-assemble toilet according to claim 1, wherein the ready-to-assemble toilet is formed of a plurality of sheets of corrugated board having a corrugated inner core, anda direction of corrugations of the inner core of each of the first to fourth sidewall portions is parallel to a height direction of the sidewall portions. 19. The ready-to-assemble toilet according to claim 1, further comprising: a spacer provided in a space surrounded by the first to fourth sidewall portions, and being in contact with the inner sidewalls of at least two sidewall portions of the first to fourth sidewall portions. 20. The ready-to-assemble toilet according to claim 1, further comprising: a fixing member provided around the first to fourth sidewall portions, and fastening the first to fourth sidewall portions. 21. The ready-to-assemble toilet according to claim 1, wherein at least one sidewall portion of the first to fourth sidewall portions includes a reinforcing wall provided so as to overlap the outer sidewall. 22. The ready-to-assemble toilet according to claim 21, wherein in the at least one sidewall portion, substantially an entirety of the outer sidewall is covered by the reinforcing wall.