To provide a state monitoring method that does not need to conduct optimization of a frequency band beforehand, and is high in determination accuracy of presence or absence of abnormality of an examined object.SOLUTION: A state monitoring method comprises: a first process of conducting filter processing with respect to measurement data using each of a plurality of band-pass filters having a mutually different center frequency, and thereby generating a plurality of first waveforms; a second process of calculating a first amount of characteristic with respect to each of the plurality of first waveforms; a third process of calculating a second amount of characteristic indicative of a characteristic of a second waveform to be obtained by plotting the center frequency of the band-pass filter and the first amount of characteristic of a time waveform generated by using the band-pass filter in a graph with the center frequency as a lateral axis and the first amount of characteristic as a vertical axis as to each of the plurality of band-pass filters; and a fourth process of determining whether an examined object is abnormal on the basis of the second amount of characteristic calculated by conducting the first to third processes with respect to test data.SELECTED DRAWING: Figure 6
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