Inertia force generating device and method for applying inertia force to blade

The invention provides an inertia force generating device and a method for applying inertia force to a blade. The inertia force generating device provided by the invention comprises an inertia force applying part for applying inertia force to a position which is 20% to 50% of the total length of a blade from the root part of the blade; and an inertial force supply unit for supplying an inertial force of a desired magnitude to the inertial force application unit by means of the mass unit. Wherein the mass part is physically isolated from the blades. According to the invention, even if the mass part is not directly connected to the blade, inertia force can be generated on the blade, and furthermore, during a blade fatigue test, the heaviest mass part can be connected, and the inertia force generating device can be connected to a place where the blade is not damaged by the inertia force generating device. Thus, the blade fatigue test can be performed with high reliability, and the damage to the blade during the