To provide a bolt come-off prevention structure surely preventing the bolt from coming off over a long period of time.
The come-off prevention structure for the bolt 37 that fastens a rotating object guard 20 to an engine room frame 12 includes a washer 43 unseparably mounted onto a non-screw shaft portion 42b between a head 41 and a screw shaft portion 42a of the bolt 37; and a cover member 45 for covering the washer 43. When the bolt 37 is not fastened, the washer 43 is butted against the cover member 45, thereby preventing the bolt 37 from coming off the rotating object guard 20. A stroke length S of the washer 43 on the non-screw shaft portion 42b is preferably not less than a length L screwed into the engine room frame 12 of the bolt 37.
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