The present disclosure relates to a refrigerator including: a cabinet that has a storage space formed therein; a grill pan that defines a rear wall surface of the storage space; a purification device that is mounted on the grill pan to suck and purify air within the storage space; and a duct unit in which a cold air passage that is formed on a rear side of the grill pan to guide cold air of an evaporator to the storage space and a purification passage that guides the air purified by the purification device to the storage space again.