To resist an intruder who peeps from a window or a glass sliding door and tries to intrude.

By moving an electric curtain right and left to produce presence of persons in a room, the intruder is resisted by positive sight, and the illegal intruder is resisted without bothering neighborhood due to noise even if malfunction occurs, without staggering a sleeping person in a house. By adding a function of automatically opening the curtain in the morning and automatically closing the curtain in the evening, the electric curtain with security function shows as if the person is present in the house even when the person is absent from home for a long period.