Abstract: An object of the present invention is to provide a humidity-dependent antibacterial powdery composition of excellent applicability wherein a volatile oily antibacterial substance can be contained in high ratio; a process for producing the same; a humidity-dependent antibacterial food storing article; and a method of storing food. The humidity-dependent antibacterial powdery composition of the present invention as means of attaining the object is characterized in that it comprises a volatile oily antibacterial substance and a water-soluble film forming agent and the behavior of release of the antibacterial substance is changed depending on humidity.