To provide a birds come-flying preventing tool which does not reduce an effect due to getting used to by irregularly and impulsively operate a come- flying preventing effective part to birds come-flying to a protecting object and giving damage, and facilitating a fixing method.

A matter 4 expressing the eye of a hawk is installed on a reflecting plate 3 being the come-flying preventing effect part. As the plate 3 irregularly, impulsively and wildly dances with an axis 2 in a center by a wind and the axis 2 is simply attached and detached to/from a supporting matter, the deterioration of the effect due to getting used to is prevented to prevent the come-flying of birds.