Provided are a drug recognizing apparatus, a drug recognizing method, and a drug recognizing program capable of enhancing robustness of a master image in a case where a drug is recognized. The drug recognizing apparatus includes an illumination unit that illuminates a drug； an imaging unit that images the illuminated drug； a storage unit that stores a master image for each drug type； a drug position acquiring unit that acquires a position of the drug on the basis of a captured image obtained by the imaging unit； a master image generating unit that generates the master image from a drug area in the captured image； an updating determination unit that determines whether to update the master image on the basis of the position of the drug acquired by the drug position acquiring unit； and a registration unit that registers the master image in the storage unit in a case where it is determined that the master image is to be updated.
