PROBLEM TO BE SOLVED: To provide a diaphragm effective for reducing stress concentration.SOLUTION: A diaphragm 1 comprises a set of first members 10 for connecting a column 80 and a set of beams 90 adjoining each other in such a manner as to surround the column 80, respectively, and a second member 20 for joining the set of first members 10 by internal corner parts 99 of the set of beams 90. The second member 20 includes a fastening part 22 that can be fastened to the set of first members 10 in a direction 111 along an axial direction 89 of the column 80.SELECTED DRAWING: Figure 1
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