To provide a simple method for preventing bird injuries by which there are repellent effects even on lightweight birds with a slight visual sense of incompatibility and detaching or shortening and developing can be carried out at a low cost.

An elastic repellent tool 2 having a plurality of curve-formed parts 1 formed of a wiry material or a belt material into a bent shape, having elasticity and arranged in the axial direction side by side is kept at a prescribed interval between the curve-formed parts 1 in an upright or an obliquely fallen state of each curve-formed part 1 and developed along the top surface of a place 4 for repelling coming flying. In the developed state, the elastic repellent tool 2 is held with a holding material H in the place 4 for repelling the coming flying to exhibit the elastic force in the direction crossing the axial direction against the coming flying and resting of the birds.