PROBLEM TO BE SOLVED: To provide a heat flowmeter and an electronic apparatus with which it is possible to accurately measure a heat flow occurring between a biological surface and an external environment.SOLUTION: A heat flow sensor 10 comprises a heat transfer layer 11 having mutually opposing first face 11a and second face 11b and having flexibility and a temperature difference measurement unit 20 for measuring a temperature difference between the first face 11a and the second face 11b of the heat transfer layer 11. The heat transfer layer 11 includes a first member having flexibility and a second member whose coefficient of thermal conductivity is higher than that of the first member, the thickness of the heat transfer layer 11 being 0.5 mm or greater, the coefficient of thermal conductivity of the heat transfer layer 11 being 10 W/(m×K) or greater, the Shore hardness of the heat transfer layer 11 being A50 or lower.SELECTED DRAWING: Figure 6【課題】生体表面と外環境との間に生じる熱流を精度良く測定できる熱流計および電子機器を提供すること。【解決手段】熱流センサー１０は、互いに対面する第１面１１ａと第２面１１ｂとを有し、可撓性を有する伝熱層１１と、伝熱層１１の第１面１１ａと第２面１１ｂとの間の温度差を計測する温度差計測部２０とを備えている。伝熱層１１は、可撓性を有する第１部材と、第１部材よりも熱伝導率が高い第２部材とを含み、伝熱層１１の厚さは０．５ｍｍ以上であり、伝熱層１１の熱伝導率は１０Ｗ／（ｍ×Ｋ）以上であり、伝熱層１１のショア硬さはＡ５０以下である。【選択図】図６
