The present invention makes it possible to separate from a combined signal waveform a signal waveform between units having identical or substantially identical configurations, for example. This waveform separating device is provided with: a storage device which stores, as a model of an operating state of a unit, a first state transition model including a segment in which a transition occurs in one direction on one path; and an estimating unit which accepts as an input a combined signal waveform from a plurality of units including a first unit that operates on the basis of the first state transition model, and which estimates the signal waveform of the first unit at least on the basis of the first state transition model and separates the signal waveform of the first unit from the combined signal waveform.
