PROBLEM TO BE SOLVED: To provide a dehydrated tea leaf in which a fermentation step that includes a lot of active ingredients in which flavor is rich, aroma is high, and hue is clear can be enjoyed.SOLUTION: A dehydrated tea leaf production apparatus includes: a decompression steam heat device 3 in which a raw tea leaf A0 is showered by prescribed temperature low temperature steam under a decompressed atmosphere so that an enzyme of a tea leaf A may not be deactivated a decompression agitation dehydration machine 5 in which the steam heated tea leaf is agitated under a decompressed atmosphere, heated by a prescribed temperature so that the enzyme of the tea leaf may not be deactivated, and dehydrated to become a prescribed intermediate moisture percentage and a decompression dehydration machine 7 in which the tea leaf dehydrated to become the intermediate moisture percentage is heated under a decompressed atmosphere by a prescribed temperature so that the enzyme of the tea leaf may not be deactivated to be dehydrated to become a prescribed objective moisture percentage.
