Problem to be solved: to provide a disaster prevention device, a disaster prevention apparatus mounting structure and an apparatus accommodating box capable of suppressing the fluctuation of the protrusion amount of the disaster prevention equipment from the front surface of the mounting object in a small size.The disaster prevention device 1 includes a flange piece 11, an insertion portion 12, and a pinching piece 13. The flange piece 11 is positioned in front of the mounting hole in the mounting object 4. The mounting object 4 has a mounting hole penetrating in the front and rear directions. The insertion portion 12 is inserted into the mounting hole. The pinching piece 13 is positioned behind the mounting hole in the mounting object 4 and sandwiches the mounting object 4 between the flange 11 and the flange 11.The disaster prevention device 1 is attached to the mounting object 4 with the attachment object 4 interposed between the flange piece 11 and the pinching piece 13.Diagram
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