To provide a rapid refrigeration method using a refrigerator for domestic use, and a secondary storage used in it.

The secondary storage 1 comprising a container body 2 and a lid 3 for opening and closing is provided in an interior of the refrigerator 10 for domestic use, the secondary storage 1 is formed by a heat insulator so that a temperature in a hollow part becomes uniform, the secondary storage 1 is cooled in the refrigerator 10 until a whole from a center to an outer surface of food 5 housed in the hollow part of the secondary storage 1 is supercooled, and the supercooled food is rapidly refrigerated in the secondary storage 1. In the secondary storage 1, an internal temperature is uniformed by covering an outer wall surface 2a and an inner wall surface 2b of a circumferential wall 2A by a metal plate 4.