The invention relates to an air purification device for a vehicle and has an object to provide a DOR (Direct Ozone Reduction) system that can improve durability of activated carbon as an ozone purifier. FIG. 3 is a partially enlarged view of a fin of FIG. 2. FIG. 3(a) is a partial enlarged view of the fin in a front side, and FIG. 3(b) is a partially enlarged view of the fin in a rear side. As shown in FIGS. 3(a) and 3(b), in a louver, a coat amount of activated carbon is adjusted so as to gradually increase from a front side toward a rear side. Thereby, durability as the radiator can be improved, while oxidation degradation of the activated carbon by active oxygen is allowed to some degree.
