To make it possible to spread the clean air introduced into a clean room for household use where an allergic patient or chemical substance hypersensitiveness patient utilizes to all corners.

A room 1 to be installed in a living space is composed. The room 1 has a prescribed closed system clean space 9 in the inside. The room 1 is provided with an introducing air cleaner 17 for cleaning the air in the living space 2 and introducing the air into the clean space 9. The cleaned air introduced by the introducing air cleaner 17 is discharged to the outside of the clean space 9 through plural discharge ports 80 dispersedly arranged in the room 1. Then, when the air is introduced into the clean space 9 by the introducing air cleaner 17, a positive pressure is generated in the clean space 9 and since the air is discharged from the plural discharge ports 80, the cleanliness in the clean space 9 is made even and uniform.