This pain measurement device for measuring pain experienced by a subject is provided with a determination unit for determining a reference stimulation intensity corresponding to reference pain of the subject, on the basis of a relationship between pain levels reported by the subject and stimulation intensities applied to the subject, and a measurement unit which compares electroencephalographic data measured from the subject and reference electroencephalographic data corresponding to the reference stimulation intensity to measure pain experienced by the subject when the electroencephalographic data is measured.