To provide an apparatus for preventing bird injuries capable of effectively taking measures for preventing birds from defecating without injuring the beauty with the simple apparatus by stretching small-diameter wires on a building.

This apparatus 1 is designed to prevent birds from perching on a building and defecating and is obtained by stretching small-diameter wires 2 at a prescribed interval under tension on the building. At this time, for example, supporting nuts 5 are attached to a coping 4 according to an optional method and the small-diameter wires 2 can then be inserted and passed through engaging parts 6 and installed by using tendons 7 and wire clips 8.