One or more embodiments of the present invention is intended to provide a protective member that is easy to carry, while ensuring enhanced mountability. A protective member of the present invention is configured as a protective member (drone guard) 2 that is mountable to an aerial vehicle (drone) 1 having a body 11 and at least one rotor 13 held on the body, and includes a plurality of support members 22 that are connectable to the aerial vehicle and have a flexible member (guard part) 23 stretched between distal end portions thereof so as to surround an outside of the body in planar view, wherein at least one of the plurality of support members has a tension adjusting mechanism that is capable of adjusting a tension applied to the flexible member in a stretching direction, by changing a distance from a center of the body to the distal end portion.