To improve accuracy and reduce costs by composing a grill elevation device of a drum that is driven by an AC synchronous motor and a wire that is extended while being wound and delivered freely by the drum and providing a suspension part that is engaged to the wire for a separation member.

A separation member that is mounted to an air-conditioner 50 so that it can be separated freely is a grill G for detachably retaining a filter. One end of first and second wires 110 and 120 is fixed to two drums 100a and 100b, and 101a and 101 and is wound so that it can be taken up and delivered freely. The other ends of the first and second wires 110 and 120 are connected by a connection means such as a hook via a pulley 130 that is a suspension part being provided at the grill G. In this manner, by suspending the first wire 110 and the second wire 120 in a U shape and suspending the grill G at the first wire 110 and the second wire 120 via the pulley 130, the need for the idling mechanism of the drum is eliminated.