To provide a compact and light-weight automatic opening and closing type curtain apparatus capable of being operated based on sensing by a sensor by using an exclusive remote controller when opening and closing a curtain and being attached to all kinds of curtain rails.

This automatic opening and closing type curtain apparatus operates based on sensing by the sensor by using the exclusive remote controller when opening and closing the curtain. A receiving sensor sensing unit and a driving unit are provided with a commercially available thick wound string fixed on an upper part of the curtain rail and used to lift into a half-opened condition on the right and left sides and an adapter for power supply, are operated by the exclusive remote controller, and are stopped at an optional position.