PROBLEM TO BE SOLVED: To provide an indoor structure with a loft capable of improving the convenience and safety of a loft. SOLUTION: The first and second lofts 10 and 20 facing each other in the horizontal direction and the floors of the first and second lofts 10 and 20 facing each other are formed so as to face each other in the horizontal direction. It is characterized in that it is provided with a passage 30 forming space S1 provided between the loft floor portions 12 and 22 and the first and second loft floor portions 12 and 22. [Selection diagram] Fig. 1
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