Provided is an instrument for measuring a physiological heat quantity, the instrument comprising a heat flux sensor (2) placed on the surface of a human body, and a calculation unit. The heat flux sensor (2) is provided with a sensor body section (10) in the form of a film, and a moisture absorbing member (14) in the form of a film. The sensor body section (10) has formed therein a plurality of through holes (40) that penetrate through the sensor body section (10) from a first surface (10a) to a second surface (10b). With the first surface (10a) side of the sensor body section (10) as a body-facing side, a sensor signal corresponding to heat flux passing through the sensor body section (10) from the first surface (10a) toward the second surface (10b) is outputted. The calculation unit calculates the physiological heat quantity emitted from the human body on the basis of the sensor signal. Due to this configuration, sweat produced on the surface of the human body can be moved via the plurality of through holes (40) to the second surface (10b) side of the sensor body section (10).生理性熱量的計量器，是具備：被設於人體的表面的熱流束感測器(2)、及算出部。熱流束感測器(2)，是具備：薄膜狀的感測器本體部(10)、及薄膜狀的吸濕構件(14)。感測器本體部(10)，是形成有從第1面(10a)至第2面(10b)為止貫通感測器本體部(10)的複數貫通孔(40)。將感測器本體部(10)的第1面(10a)側作為人體側，從第1面(10a)朝向第2面(10b)將對應通過感測器本體部(10)的熱流束的感測器訊號輸出。算出部，是依據感測器訊號，算出從人體被放出的生理性熱量。由此，可以將在人體的表面發生的汗，透過複數貫通孔(40)，朝感測器本體部(10)的第2面(10b)側移動。
