PURPOSE:To control the temperature, etc. of the ripening chamber automatic alloy so as to obtain a banana having optimum ripening degree at the scheduled shipping date, by detecting the accumulated amount of carbon dioxide gas emitted from the banana stored in the chamber, thereby determining the ripening degree of the banana. CONSTITUTION:The concentration of carbon dioxide gas in the chamber 1 for storing banana is measured by the detector 2, and the temperature in the chamber is raised or lowered by the heating or cooling means 10 and 11. The microcomputer 6 controls the heating or cooling means 10 and 11 by the output signal of the detector 2 according to the preset program for the post-ripening of banana. Since the post-ripening of banana can be carried out automatically, the labor for the post-ripening can be saved, and since the operation and procedure of post-ripening are predetermined, the labor can be saved and the ripening degree, i.e. the quality of the banana at the scheduled shipping date can be made uniform.
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