A novel internal temperature measuring method capable of simultaneously achieving high speed and accuracy of measurement by using a simple and low cost structure is characterized in that the thermal resistance on the heat radiation surface of the first temperature sensor (32) and the second temperature sensor (33 ) Of the heat dissipating surface of the first temperature sensor (32) and the heat absorbing surface of the second temperature sensor (33) are measured on the surface to be measured of the object to be measured, In a steady state, a first temperature T which is the temperature of the first temperature sensor (32)1And the second temperature T which is the temperature of the second temperature sensor (33)2 Measuring an ambient temperature T which is a temperature around the first temperature sensor (32) and the second temperature sensor (33)E, Measuring the first temperature T in a steady state1, The second temperature T2, The environmental temperature TEAnd an internal temperature T of the object to be measured from the ratio KB簡易かつ低コストの構造を用いて、測定の高速性と精度を両立させ得る新規な内部温度測定方法は、第1の温度センサ(32)の放熱面における熱抵抗と第2の温度センサ(33)の放熱面における熱抵抗の1でない比Kを求める工程と、第1の温度センサ(32)の吸熱面及び第2の温度センサ(33)の吸熱面を測定対象物の被測定面に熱的に接触させる工程と、定常状態において第1の温度センサ(32)の温度である第1の温度T1と第2の温度センサ(33)の温度である第2の温度T2を測定する工程と、第1の温度センサ(32)及び第2の温度センサ(33)の周囲の温度である環境温度Teを測定する工程と、定常状態における前記第1の温度T1、前記第2の温度T2、前記環境温度Te及び前記比Kより前記測定対象物の内部温度TBを算出する工程と、を有する。
