PROBLEM TO BE SOLVED: To improve accuracy in measuring a temperature at a deep portion.SOLUTION: A temperature measurement device includes a temperature measurement unit 43, an arithmetic logical unit 74, and a control unit 73 for controlling operations of the temperature measurement unit and the arithmetic logical unit. The temperature measurement unit 43 includes: a base material 40 having a first surface which is a surface contacting with an object to be measured and a second surface which faces the first surface and is a surface on the surroundings side； a first temperature sensor 50； a second temperature sensor 52； and a third temperature sensor 55. The first temperature sensor 50, the second temperature sensor 52, and the third temperature sensor 55 perform multiple measurements of a first temperature Tb, a second temperature Tp, and a third temperature Tout', respectively, under the conditions that a value of a temperature Tout of the surroundings is different. The arithmetic logical unit 74 calculates a deep portion temperature Tc in a deep portion of the object to be measured, by using the measured temperatures and on the basis of an operation expression for the deep portion temperature.【課題】深部温度の測定精度を向上させること。【解決手段】温度測定装置は、温度測定部４３と、演算部７４と、温度測定部および演算部の動作を制御する制御部７３と、を含み、温度測定部４３は、被測定体との接触面である第１面と、第１面に対向する面であって、環境側の面である第２面とを有する基材４０と、第１温度センサー５０と、第２温度センサー５２と、第３温度センサー５５と、を有し、前記第１温度センサー５０、前記第２温度センサー５２および前記第３温度センサー５５は、環境の温度Ｔｏｕｔの値が異なるという条件の下で、第１温度Ｔｂ、第２温度Ｔｐおよび第３温度Ｔｏｕｔ’を複数回、測定し、演算部７４は、測定された温度を用いて、被測定体の深部における深部温度Ｔｃを、深部温度の演算式に基づいて求める。【選択図】図１
