PROBLEM TO BE SOLVED: To provide a bird damage prevention tool which is capable of preventing birds from flying to a wire correspondingly to the wire under various situations and improves workability.SOLUTION: A wire mounting part 4 and an isolation part 5 are included, respectively, in one-side rising body 1a and another-side rising body 1b. The wire mounting part includes one arm 6 and another arm 7. The one arm and the other arm are pivoted so as to be freely opened/closed. When the one arm and the other arm are closed, a wire D is surrounded at an inner peripheral side. The one-side rising body and the other-side rising body are mounted to be freely movable along the wire D. A center P of gravity is set at a lower side of the isolation part, and a regulation material 3 can be mounted to the isolation part in a freely removable manner. The regulation material is installed between the isolation parts of the one-side rising body and the other-side rising body. An interval holding member 2 is installed betwee
