PROBLEM TO BE SOLVED: To provide a vibration reduction structure which inhibits fracture of a hanging bolt even when receiving large tremor caused by an earthquake etc. and is easily installed to the hanging bolt, and to provide a vibration reduction structure attachment tool and an installation method of the vibration reduction structure.;SOLUTION: A vibration reduction structure 11 is formed into a cylindrical shape that encloses a periphery of a hanging bolt 3 positioned immediately below a fixing member 2 and includes: a first member 15 that is one half-split body of the vibration reduction structure 11 and has a first support member 21 and a first attenuation member 22-1; and a second member 16 which is the other half-split of the vibration reduction structure 11, includes a second support member 51, a pair of protruding parts, and a second attenuation member 22-2, and is fixed to the first member 15.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT
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