PURPOSE: To enhance ventilation performance and air cleaning performance as a combined function with improvement heating environment in an air conditioner, and to reduce the cost of a heat exchanger main body.

CONSTITUTION: A ventilation and air cleaning element 9 comprises a heat exchanger main body 13 which doubles rectangular-shaped fins in the same direction, a mouth piece 14A and a mouth piece 15B. The ventilation and air cleaning element 9 clamps the heat exchanger main body 13 with the mouth piece 14B and the mouth piece 15B in the shape of a sandwich.