This dissatisfying conversation determination device include: a data acquisition unit that acquires a plurality of word data, and a plurality of phonation time data by target conversation participants; an extraction unit that extracts a plurality of specific word data configuring polite expression and impolite expression from the plurality of word data; a change detection unit that detects a point of change from polite expression to impolite expression by the target conversation participants based on the plurality of specific word data and the plurality of phonation time data; and a dissatisfaction determination unit that determines whether the target conversation is a dissatisfying conversation for the target conversation participants based on the result of the point of change detected by the change detection unit.
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