To provide a persimmon astringency-removing apparatus, capable of preventing the global warming because the carbon dioxide gas after finishing the treatment is recovered and reused, and the carbon dioxide gas is not released in the atmosphere.

Persimmons, vegetables and fruits cereals and eggs stored in containers 3 are inserted in an airtight chamber 2, and the chamber is charged with carbon dioxide gas 8. When the concentration of the carbon dioxide gas in the airtight chamber 2 becomes equal to or less than a set value of a No.1 carbon dioxide gas detector 11, the gas in the airtight chamber 2 is separated to the carbon dioxide gas 15 and an unnecessary gas 16 by a No.1 carbon dioxide gas-separating apparatus and a polymer membrane gas-separating apparatus 14, and the unnecessary gas 16 is exhausted into the atmosphere 17 to maintain the concentration of the carbon dioxide gas in the airtight chamber 2. The carbon dioxide gas 20 in the airtight chamber 2 after finishing the treatment is collected in a storing tank, and when the carbon dioxide concentration in the storing tank becomes equal to or lower than the set value of a No.3 carbon dioxide gas concentration detector 22, the gas in the storing tank is separated to the carbon dioxide gas 25 and an unnecessary gas 26 by a NO.2 carbon dioxide gas-separating apparatus and a polymer membrane gas separation apparatus 24, and the unnecessary gas 26 is exhausted to the atmosphere to keep the carbon dioxide gas concentration in the storing tank constant, and to reuse the recovered carbon dioxide gas to the next time treatment.