The invention provides an evaluation method of an impact test and an impact tester, capable of simply and accurately obtaining a natural frequency of the impact tester and reducing influence of vibrations originating from natural vibration, without adding a special machine for measuring the natural frequency of the impact tester. A personal computer includes, as a functional configuration, a dataextraction section extracting from time-series data of force a data section for obtaining a natural frequency of an impact tester in a natural vibration analysis, an analysis section carrying out a frequency spectrum analysis on the extracted data section, and a vibration waveform removal section removing a natural vibration waveform of the impact tester from force data. The data extraction section, the analysis section and the vibration waveform removal section are respectively stored as a data extraction program, an analysis program and a vibration waveform removal program in a memory.