Fecha de publicación: 29/12/2022 Fuente: WIPO (eseential oils OR extracts) An abnormality detection device (10) is provided with: an acquisition unit (15a) for acquiring time-series data of a detection target in which abnormality at a predetermined time point is detected; a first extraction unit (15b) that extracts, from the time-series data, a feature in a feature amount direction at a time interval earlier than the predetermined time point; a second extraction unit (15c) that extracts, from the feature in the feature amount direction, a feature in a time direction in the time interval; and a calculation unit (15d) that calculates an abnormality score at the predetermined time point on the basis of the feature in the feature amount direction and the feature in the time direction and that calculates the degree of contribution of the time direction to the abnormality score and the degree of contribution, to the abnormality score, of the feature amount direction at a time point earlier than the predetermined time point.