PROBLEM TO BE SOLVED: To provide a moisture meter which enables an easy measurement of the moisture content of a human subject and which is efficient as an aid to appropriately control the moisture content of the subject.SOLUTION: The moisture meter 1 comprises a moisture measurement part 30 which is to be held under the armpit (R) of a human subject (M) and by which the moisture content in the armpit (R) is measured to thereby determine the moisture content of the subject (M). The moisture measurement part 30 is provided with a round covering member 34, which is a mesh-shaped member and, when held under the armpit (R), allows the permeation of vapor, i.e., the moisture in the armpit (R), and a humidity sensor 33 which is provided within the round covering member 34 and brought into contact with the vapor. The moisture meter 1 comprises a body part 10, a measurement part holder 12 holding the moisture measurement part 30 and a body temperature measurement part 31, the measurement part holder being to be held under the armpit (R), and a display holder 12 holding a display 20, the display indicating the moisture content of the subject (M) thus measured and the body temperature of the subject (M) thus measured.COPYRIGHT: (C)2012,JPO&INPIT【課題】被検者の水分量を簡単に測定することができ、被検者が適正な水分調節を行うための支援手段として有効な水分計を提供する。【解決手段】水分計1は、被検者Mの腋下Rに保持されて、被検者Mの水分量を測定するために腋下Rの水分を測定するための水分測定部30を有し、水分測定部30は、網状の部材であり腋下Rに位置されて腋下Rの水分の水蒸気を通す周囲覆い部材34と、周囲覆い部材34内に配置されて水蒸気に触れる湿度センサ33を備え、水分計1は、本体部10と、水分測定部30と体温測定部31を保持して腋下Rに挟持される測定部の保持部12と、測定された被検者Mの水分量と測定された被検者Mの体温を表示する表示部20を保持する表示部の保持部12を有する。【選択図】図4