PURPOSE: To prevent wasteful consumption of perfume by providing a perfume base in a filter, incorporating a perfume body in the base, allowing the body to protrude above a filtering element, providing a cover attached to a hinge, and opening and closing the cover by an air stream.

CONSTITUTION: A perfume body 1 is mounted in a perfume base 3 provided in a filter body 2. A cover 4 is mounted at a hinge 5, which is mounted at the body 2. When the cover 4 is disposed at a position for blocking a perfume evaporation port of the body 1, it is formed in size in which its end protrudes above a filter medium 6 extended to the body 2. When an air conditioner 7 is operated, the air is sucked to a fan 8 through the medium 6. In this case, the cover 4 is induced by the air flow to be opened upward, fragrance is evaporated from the body 1 and diffused into the room. When the air conditioner 7 is stopped, the flow of the air is stopped, and the cover 4 is moved down by its own weight to prevent evaporation of the perfume.