A suspiciousness degree estimation model generation device includes: a clustering unit that performs clustering on an input face image based on the feature extracted from the face image; and a suspiciousness degree estimation model generation unit that generates a suspiciousness degree estimation model used for estimating the suspiciousness degree of an estimation target person, based on the result of clustering by the clustering unit and suspiciousness degree information that is previously associated with a face image included by the clustering result and that shows the suspiciousness degree of a person shown by the face image. The suspiciousness degree estimation device includes: a feature extraction unit that extracts a feature from a face area of an estimation target person; and a suspiciousness degree estimation unit estimates the suspiciousness degree of the estimation target person, based on the feature extracted by the feature extraction unit and the suspiciousness degree estimation model generated by the suspiciousness degree estimation model generation device.