PROBLEM TO BE SOLVED: To provide a heat separation method, a heat recovery method, a gas-heat separation method, a gas-heat separation and recovery method, a heat separation device, a gas- heat separation device, a gas-heat separation and recovery device, and a fusion device which can prevent or avoid corrosion of a device and penetration of radioactive substances.SOLUTION: The fusion device according to the present invention includes the gas-heat separation device (container 13) according to the present invention. The gas-heat separation device according to the present invention can separate and recover tritium and includes a nuclear fusion plasma 11 for nuclear-fusing the recovered tritium.SELECTED DRAWING: Figure 1
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