Abstract: The invention is an insect pest behavioral disturbance inducer which comprises an organic ester compound having a vapor pressure of 10?3 Pa (25° C.) order or less as an active ingredient, a functional fiber and a functional fabric, which hold aforementioned insect pest behavioral disturbance inducer, and a functional fiber product comprising the aforementioned functional fiber or a functional fabric, which can add excellent insect pest behavioral disturbance inducing effect to the applying place for a prolonged period of time.