Provided is a moisture meter that can easily measure a moisture content of a subject and can be effectively used as means for assisting the subject in appropriately regulating the moisture content. A moisture meter (1) for measuring a moisture content of a subject includes: a moisture measuring unit (30) that is held in an armpit (R) of a subject (M) so as to measure a moisture content of the subject (M), the moisture measuring unit including measurement current supply electrode portions (30A and 30B) and voltage measurement electrode portions (100A and 100B) that make contact with a skin surface of the armpit (R)； and a temperature measuring unit (31) that is held in the armpit (R) of the subject (M) so as to measure the temperature of the subject (M).
