Described is an apparatus for measuring a water transpiration amount, which comprises a barrel-type body having a humidity sensor inside of the body and opening portions on the top and bottom of the body, wherein a gas introductory path for feeding, from the outside of the apparatus, a gas having a predetermined water content to a surface to be measured is disposed at the side wall portion of the body and a freely openable or closable shutter is installed at the bottom opening portion of the body.;The apparatus according to the present invention makes it possible to carry out accurate and prompt measurement of a water amount transpired locally from the skin surface, ocular surface or the like without being influenced by the external circumstances such as wind.
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