To use only a portable cooler box, by easily separating a cooler in use by carrying, while cooling the inside of the box by easily connecting to the portable cooler box.
A circulating hose 3 has the tip side detachably connected to a hose installing tool 12 of the portable cooler box 1, and is formed into a double structure. A cold air supply passage 31 is arranged on its inside, and a radiating cold air recovering passage 32 is arranged on its outer peripheral side, and a cold air chamber 22 and a recirculating chamber 23 are arranged in the cooler 2. A radiator 21a of a cooling mechanism 21 is arranged in a communicating place of the cold air chamber 22 and the recirculating chamber 23. The base end of the cold air supply passage 31 is connected to the cold air passage 22, and an air blowing fan 24 for sending in cold air is arranged in the cold air supply passage, and the base end of the radiating cold air recovering passage 32 is connected to the recirculating chamber 23.
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