To make it possible to simply set a bird injury-preventing device even by a non-expert person.

This device for preventing bird injuries comprises a support portion 100 in which a support column portion 110 is disposed and an arm portion 200 attached to the support column portion 110 in a laterally projecting state. The arm portion 200 has a connection member 210 attached to the support column portion and an arm main body 220 attached to the connection member 210. The connection member 210 comprises a support column side coil body 211 attached to the support column portion 110 and an arm side coil body 212 attached to the end of the arm main body 220. Both the coil bodies 211 and 212 are engaged with each other to attach the arm portion 200 to the support portion 100.