PURPOSE: To provide a cold heat accumulating tank, capable of increasing the occupying rate of ice in a sealed vessel as much as possible.

CONSTITUTION: A cold heat accumulating tank 5 is provided with a sealed vessel 51, consisting of a heat conductive material, cold heat accumulating agent 52, such as the water solution of ethylene glycol and the like and filled into the sealed vessel 51, and an evaporator 53, received in the sealed vessel 51 and evaporate liquid refrigerant in the vessel to cool and solidify the cold heat accumulating agent 52 therearound, while the sealed vessel 51 is provided with belt type heat radiating fins 56 on the outer surfaces thereof. According to this method, the cold heat accumulating agent 52 can be solidified in all of the inside of the cold heat accumulating tank 5 while cold heat, accumulated in the cold heat accumulating tank 5, can be radiated from the outer surfaces of the tank 5.