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On Accuracy of Measurement of Dynamic Elastic-Plastic Fracture Toughness by Instrumented Charpy Test Toshiro KOBAYASHI, Isamu YAMAMOTO and Mitsuo NIINOMI Synopsis: It had been developed in the previous study that dynamic elastic-plastic fracture toughness parameters Jd and T mai could be evaluated from Instrumented Charpy impact test. However, to popularize this method, strict neasuring method and judging standard on validity of obtained values must be established. One old and important problem to be clarified is a relationship between an instrumented energy (Es) obtained from area under a load-deflection curve and a dial reading energy (Er) calculated from a potential energy of hammer. The purpose of this study is, therefore, to solve this problem at first and also to clarify the dynamic phenomena accompanying with the measurement of load-deflection curve. It is concluded that the energy condition necessary for test without changing the load-deflection relationship is Eo(applied energy) 3E(total absorbed energy). This is the necessary condition to evaluate meaningful values of Jd and tearing modulus (Tmat). Moreover, it is shown how the vibrational wave superimposes the load-deflection curve analyzing the vibrational mode shape of the hammer.