PROBLEM TO BE SOLVED: To provide a bird damage prevention rotor support tool capable of being easily and firmly attached to an architectural structure such as a steel tower.SOLUTION: A bird damage prevention rotor support tool comprises a pair of semicircular arc shaped members 10, 20 having outer peripheral edges on which rail parts 11, 21 are formed so that a bird damage prevention rotor 40 is to be freely rotatably supported on the rail parts. One semicircular arc shaped member 10 has an inner peripheral edge molded integrally with a V-shaped force-receiving part 17 whose opening angle is 90 degrees the other semicircular arc shaped member 20 has a convex crimp part 25 molded integrally by providing, on both sides of the convex crimp part, curvature arm shaped high elasticity parts 26a, 26b connected to an inner peripheral edge of the other semicircular arc shaped member. Bonding the pair of the semicircular arc shaped members 10, 20 in an annular shape causes the V-shaped force-receiving part 17 and convex crimp part 25 to elastically clamp an angle material 30 having an L-shaped cross section.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2016,JPO&INPIT