A mental load cannot be appropriately evaluated when a tremor is detected by wearing an acceleration sensor on an arm and the like of a test subject； therefore, a tremor detector according to an exemplary aspect of the present invention includes pressure distribution detecting means for detecting pressures on a plurality of places in a plane and generating pressure information of information on pressure distribution in the plane； feature quantity extracting means for extracting a feature quantity from the pressure information； and tremor feature quantity extracting means for extracting a tremor-frequency feature quantity that is a frequency component of the feature quantity and includes a frequency component corresponding to a physiological tremor.
