To provide a structure for preventing coming off of a bolt, protecting a bolt head while preventing coming off of the bolt.
This structure for preventing the coming off of the bolt 16 tightening a rotating object guard 7 to a stay 13 includes a cover member 20 forming a space 17 to store the bolt head 16a between the rotating object guard 7 and the cover member. The cover member 20 is formed with an opening 21 for inserting the bolt head 16a, a slipping-out preventive ring 30 abutting on the edge of the opening 21 is mounted around a bolt shaft portion 16b, and the slipping-out preventive ring 30 abuts on the edge of the opening 21 during the non-tightening of the bolt 16. Thereby, the bolt 16 is prevented from coming off from the rotating object guard 7.
NODA TAKASHI
IBUKI TOSHIO
TAKEUCHI YASUHIKO
SHIOMOTO YUJI
KAWAMURA KOTARO
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