Cold storage

A cold storage unit comprising:

• a heat-insulating outer housing,
• an inner housing of a heat conductive material in said outer housing with a space therebetween and defining within said inner housing a storage chamber,
• a cooling device located to circulate cold air in the space between said outer and inner housings to indirectly cool the storage chamber,
• an adsorbing and decomposing sheet-like agent comprising an ethylene decomposing catalyst and active carbon provided in communication with said storage chamber, and
• a box member attached on a side wall of said inner housing on the cold air circulating space side, said adsorbing and decomposing sheet-like agent being located in said box member, and vent holes being located in said box member and said inner housing side wall through which upper and lower parts of said box member communicate with said storage chamber for a flow of air from the storage chamber through said sheet-like agent in said box.