Problem to be solved: to provide a bird protection device capable of easily passing between a pair of edge lines.The bird protection device 10 isStraight tubular member 11A plurality of stages are arranged in the axial direction of the tubular memberA plurality of branch members 12, 13, 14 projecting radially from the outer periphery of the tubular memberA main shaft member 15 which is inserted into the tubular member 11 so as to be freely inserted thereinAndThe base end is fixed to the outer periphery of the main shaft memberA plurality of branch bars 16 are provided on the tip end side so as to be able to move back and forth in a state of tilting downward from the leading edge of the branch members 12, 13, 14 in the outer circumferential direction.In the state in which the main shaft member 15 having a plurality of branch bars 16 moves toward the proximal end side of the tubular member 11, the virtual circumference of the plurality of branch bars 16 is expanded and the main shaft member 15 having a plurality of branch bars 16 is moved toward the distal end side of the tubular member 11, and the distal end of the plurality of branch bars 16 The diameter of the virtual circumference connecting the edges can be reduced.Diagram【課題】一組の縁線の間を容易に通過できる鳥害防止具を提供する。【解決手段】鳥害防止具１０は、真直に延びる管状部材１１、管状部材１１の軸方向に多段に配置し、管状部材１１の外周から放射状に突出した複数の分岐部材１２・１３・１４、管状部材１１の内部に挿通自在に配置した主軸部材１５、及び、基端部を主軸部材１５の外周に固定し、先端部側が分岐部材１２・１３・１４の先端縁から外周方向に下り傾斜した状態で進退自在に突出できる複数の枝棒１６を備える。複数の枝棒１６付き主軸部材１５が管状部材１１の基端部側に向かって移動した状態では、複数の枝棒１６の先端縁を結ぶ仮想の円周を拡径し、複数の枝棒１６付き主軸部材１５が管状部材１１の先端部側に向かって移動した状態では、複数の枝棒１６の先端縁を結ぶ仮想の円周を縮径できる。【選択図】図１
