Provided is a pain estimating device with which it is possible to estimate objectively and accurately pain being experienced by a subject. A pain estimating device 110 estimates the magnitude of pain being experienced by a subject, on the basis of brain waves of the subject, and is provided with: a measuring unit 111 which acquires a plurality of items of brain wave data or analysis data thereof by measuring brain waves from the subject a plurality of times; and an estimating unit 112 which estimates the relative magnitude of the pain being experienced when the brain wave measurements were conducted a plurality of times, from the plurality of items of brain wave data or the analysis data thereof (for example the amplitude), on the basis of the linearity of a relationship between the brain wave data or the analysis data thereof (for example the amplitude) and the pain. The present invention also provides a pain estimating method and device with which it is possible to estimate objectively and accurately pain being experienced by a subject, and to classify simply the quality and quantity thereof. The present invention also provides a method for generating a pain classification value for classifying pain being experienced by the subject, on the basis of brain waves of the subject.
PAIN ESTIMATING DEVICE, PAIN ESTIMATING METHOD, AND PAIN CLASSIFICATION