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. SOLUTION: This is a method of adjusting the height of upper and lower floors by using a jig 40 for adjusting the height of upper and lower floors to adjust the heights of building units 1 adjacent to each other in the horizontal direction through a gap 101. Then, when the heights of the floor plates 17A and 17B of the upper floor building units 1b and 1d adjacent to each other in the horizontal direction across the gap 101 are different, the rod member 41 is inserted from the lower end of the gap 101 and the other end is inserted. The step of projecting from the other end of the gap 101 between the floor plates 17A and 17B, the upper plate member 43 and the washer 44 are attached to the male threaded portion 41a of the other end of the rod member 41, and the nut 45 is further attached to the male threaded portion 41a. The step of raising the lower girder roof girder 13B by the lower plate member 42 and indirectly lowering the higher floor plate 17A sandwiching the gap 101 by the upper plate member 43 is executed by the fastening force for fastening the above. [Selection diagram] FIG. 7
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