PURPOSE: To same material cost by making heat transfer plate thin.

CONSTITUTION: A refrigerating box 10A is arranged above a stirling engine 1 and a heat insulating material 13 such as urethane foam is packed between a box shaped outer case and an inner case 12. Aluminum or the like with a thickness T1 so set to realize necessary temperature of freezing goods to be housed is applied on a heat transfer plate 14d on the bottom wall of the inner case 12 and aluminum or the like is applied on a heat transfer plate 14c of a side wall with a thickness T2 thereof corresponding to the temperature required for the side wall and an upper part thereof. A refrigerating chamber 15 is formed in the inside surrounded by the heat transfer plates 14c and 14d to house freezing goods and a lid 16 is provided at an opening part at an upper part of the refrigerating chamber 15 to load or unload the freezing goods.