PROTECTIVE DEVICE

The present invention includes a plurality of protective bodies (13, 14, 15) sequentially connected in a moving direction of a moving body and separating a movement path of the moving body from the outside. The protective body (15) at a first end is connected to a predetermined end (12a) of an area to be protected, and the protective body (13) at a second end is connected to the moving body. The plurality of protective bodies (13, 14, 15) are configured to be expanded and contracted as a whole by movement of the moving body. A structural body (35) having a groove (35a) having a top opening and forming a flow path is provided. The structural body (35) is arranged along the protective bodies (13, 14, 15) below the protective bodies (13, 14, 15) or arranged along the protective bodies (13, 14, 15) such that the lower ends of the protective bodies (13, 14, 15) are inserted in the groove (35a) through the top opening of the groove (35a). The groove body (35) is provided with a nozzle (38) ejecting a liquid into the groove (35a), and a pressurized liquid is supplied to the nozzle (38) from a liquid supply source (40).