To understand the core temperature more accurately.SOLUTION: The internal body temperature measuring device that comprises a temperature sensor (20S) for measuring the temperature of the skin of a living matter, a heat flux sensor (20) for measuring the size of a heat flux emitted from the body surface of the living matter, a blood flow sensor (30) for measuring the blood flow rate in the vicinity of the heat flux sensor, and a memory unit (50) for memorizing the relationship between the blood flow rate in the vicinity of the heat flux sensor and the temperature and depth of the core part calculates a correction amount of the temperature and depth of the core part corresponding to the blood flow rate in the vicinity of the heat flux sensor on the basis of the relationship memorized by the memory unit, and calculates the temperature of the core part of the living matter on the basis of the skin temperature measured by the temperature sensor, the size of the heat flux measured by the heat flux sensor and the correction amount of the temperature and depth of the core part.SELECTED DRAWING: Figure 1【課題】核心部温度をより正確に把握する。【解決手段】生体内温度測定装置を、生体の表皮温度を測定する温度センサ（２０Ｓ）と、前記生体の体表部から放出される熱流束の大きさを測定する熱流束センサ（２０）と、前記熱流束センサの近傍の血流量を測定する血流センサ（３０）と、前記熱流束センサの近傍の血流量と核心部温深度との関係を記憶した記憶部（５０）とを設け、前記記憶部に記憶された前記関係に基づいて前記熱流束センサの近傍の血流量に対応する核心部温深度の補正量を求めるとともに、前記温度センサで測定された表皮温度と、前記熱流束センサで測定された熱流束の大きさと、前記核心部温深度の補正量とから前記生体の核心部温度を算出する。【選択図】 図１
