To provide a pollen entering preventive room using a double space, ensuring comfortable living always without entering of pollen in a season when pollen comes flying in the internal space of a living room.

This pollen entering preventive room using a double space includes: a simple space 3 supported 2 from a ceiling part of an existing living room interior 1; an entrance 4 for entering the simple space 3; an air blowout port 5 provided in the ceiling part of the simple space 3; an exhaust port 6 provided in the lower part; and a blower 8 for feeding the air into the simple space 3 through a filtering filter 7 for removing pollen.