To reduce the economic burden and mental burden of a resident and to form a wall surface portion of a living room without infringement of a divisional ownership in the case of a multi-family house such as an apartment, To provide an indoor living space forming body.SOLUTION: The indoor living space forming body 100 is installed in the living room space 11 formed by the elevator 10 of the building, and is detachably joined to each other and comprises a plurality of frame members 12 forming a skeleton of the living space And a space defining member 13 detachably fixed to the frame member 12 and forming a living space. The plurality of frame members 12 include a columnar frame member 12 a erected on a living room floor surface portion 23 formed on a skeleton floor portion, a beam-like frame member 12 b stretched and joined between the columnar frame members 12 a . Further, the space defining member 13 is made of a plate-like member and includes, for example, a wall forming member 32, a door forming member, and a sliding door forming member.BACKGROUND OF THE INVENTION
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