To provide a storage system and a storing method of stored objects capable of more effectively utilizing the cold of natural cold air in cool season.

This storage system comprises a storage 10 for storing the stored objects, and plural kinds of refrigerants 20, 21 frozen by natural cold air and having different melting points for cooling the inside of the storage, and this storing method of the stored objects includes a process for freezing the plural kinds of refrigerants of different melting points by the cold of natural cold air in cool season, and a process for cooling the inside of the storage by the cold of the plural kinds of frozen refrigerants.