PROBLEM TO BE SOLVED: To eliminate a step and make the heights of floor plates uniform when the heights of floor plates of a building unit on an upper floor are different. When the heights of building units 1 adjacent to each other in the horizontal direction with a gap 101 are different, an upper locking member 52 is placed between girder roof girders 13A and 13B on a lower floor together with a rod member 51. It is inserted upward along the above, arranged at a height between the floor plates 17A and 17B and the girder floor girders 12A and 12B, the rod member 51 is rotated, and the upper locking member 52 is inserted into the space 102. Further, the rod member 51 is pulled downward, the upper locking member 52 is bridged to the girder floor girders 12A and 12B, the lower plate member 53 is attached to the lower end of the rod member 51, and the nut 55 is further attached to the male screw portion 51a. Is fastened, and the fastening force is input from the upper locking member 52 and the lower plate member 53 from the upper surfaces of the girder floor girders 12A and 12B and the lower surfaces of the girder roof girders 13A and 13B. [Selection diagram] FIG. 14B
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