the purpose of the present invention is to provide an air - purifying device for a vehicle that uses an ozone purifier including activated carbon . this air - purifying device for a vehicle , provided by the present invention , comprises an ozone purifier which includes activated carbon and being disposed on the surface of an on - vehicle component arranged on a portion where an air flow passage is formed while a vehicle is traveling . the ozone purifier is prepared so that the mean pore size of the activated carbon is preferably 10 nm or less so as to be smaller than the mean particle size of the particulate matter from the vehicle .