Hygrometer and temperature-humidity chamber provided

摘要

A hygrometer contains: a heat transfer section (12) which extends from a measuring space (S1) towards an outside space (S2) which is separated from the measuring space by a thermal insulation section (100); a heat release amount control unit (20, 120) that causes heat to be released from the heat transfer section (12) to the outside (S2) so that an amount of heat (q) given to the outside (S2) is made constant; and a computing device (32) which calculates a humidity (U) of the measuring room (S1). The computing device (32) calculates the humidity (U) of the measurement room (S1) from a heat transfer section temperature (t) and a measurement room temperature (t) using a relationship based on a heat balance in the heat transfer section (12) when condensation in a range ( 12a) of the heat transfer section (12) which takes place inside the measurement space (S1) in a state in which the amount of heat given off from the heat transfer section (12) to the outside space (S2) is made constant by the heat release amount control unit (20, 120) , based.