PROBLEM TO BE SOLVED: To provide a heating treatment tool which has no risk of electric shock due to electric leakage.SOLUTION: A heating treatment tool comprises: a projector (10) for emitting a laser beam an optical fiber device (20) to which the laser beam enters thereby generating a first reflectance and a second reflectance an optical receiver (30) for receiving an interference light of the first reflectance and the second reflectance emitted from the optical fiber device (20) and an analyzer (40) for analyzing a signal output from the optical receiver (30). The projector (10) performs radiation in which a first laser beam for temperature measurement and a second laser beam for heating are overlapped.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】漏電による感電のおそれのない加熱治療器を提供する。【解決手段】レーザ光を出射する投光器(10)と、レーザ光が入射されることで第1の反射光と第2の反射光を生じさせる光ファイバ装置(20)と、光ファイバ装置(20)から出射された第1の反射光と第2の反射光の干渉光を受光する受光器(30)と、受光器(30)から出力された信号を解析する解析器(40)とを備えた加熱治療器であって、投光器(10)からは、温度計測用の第1のレーザ光と、加熱用の第2のレーザ光を重ね合わせた照射を行う。【選択図】図1