A drug collation device 10 includes a registered image acquisition unit 12 that acquires an image of a drug as a registered image on the basis of prescription information 22, a collation image acquisition unit 14 that acquires an image of a drug to be collated as a collation image, a similarity calculation unit 16 that calculates similarities between partial images in each corresponding divided region among a plurality of divided regions of the registered image acquired by the registered image acquisition unit 12 and a plurality of divided regions of the collation image acquired by the collation image acquisition unit 14, and a determination unit 18 that determines whether the drug indicated by the registered image and the drug indicated by the collation image are the same type, on the basis of the lowest similarity among a plurality of similarities calculated by the similarity calculation unit 16.
