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Engineering l603 − l Kamitomioka ， Nagaoka 940 − 2188， Japan Measuring internal temperature distributions of a heated material is an important issue jn the field of material science and engineering ． This is because such temperature distribution o 丘en plays an imp (π tant role in understandhlg the behavior of materials being processed at high temperature ． In our previous work ， an ultrasonic technique providing effective measurements of internal temperature profiles of heated materials has been developed and its potential is demonstrated experimentally ． ln this work ， the use of shear wave is attempted to measure internal temperatUre prefile of aheated steel using the ultrasonic technique ， It is expected that the use of shear wave may be effective to improve the accuracy in deter 血 ning temperature because of its relatively slower velocity ． An experiment with both longitudinal and shear wave transducers has demonstrated ． Two temperature distributions obtai皿 ed usilg the longitudinal and shear waves are compared with each other ． Although those results almost agree wi 血 that obtained using thermocouples ， the result us 血 g shear wave is not always better than that using longitudinal wave ， This is because of the deterioration of the shear wave signal durj 皿 g heating ・