A drug inspection device includes an image acquisition unit that acquires a plurality of captured images obtained by imaging a bundle of drug sheets bundled in a state where at least some thereof overlap each other, the image acquisition unit acquiring the captured images including at least some of respective drug sheets with respect to all the drug sheets； a drug classification specifying unit that specifies a drug classification from the captured images； an outer edge information extraction unit that extracts information of an outer edge of each of the drug sheets from the captured images； a number-of-sheets counting unit that counts the number of drug sheets based on the information； an outermost layer sheet specifying unit that specifies an outermost layer sheet present on an outermost surface portion of the bundle； and a first drug counting unit that counts the number of drugs in the outermost layer sheet.
