A metal air battery includes an air purification module which communicates fluid to a battery cell module, purifies air flowing from an outside, and supplies the purified air to the battery cell module. The air purification module includes: a first air purifier which filters a first impurity of a plurality of impurities in the air flowing from the outside; and a second air purifier which filters a second impurity of the plurality of impurities, which is different from the first impurity.