A packaged drug inspection device comprising: a dispensing information acquisition unit that acquires dispensing information of drugs packaged in a packet; a number-by-appearance information acquisition unit that acquires number-by-appearance information indicating the number of drugs for each outward appearance, which correspond to each dose and are packaged in each packet, on the basis of at least the dispensing information and a drug type information; an imaging unit that captures an image of the drugs corresponding to each dose; a number-by-appearance counting unit that counts the number of drugs for each outward appearance which correspond to each dose, on the basis of the image of the drugs captured by the imaging unit; a number-by-appearance error determination unit that determines whether the number of drugs for each outward appearance which correspond to each dose is correct, on the basis of the number-by-appearance information and the counting result of the number-by-appearance counting unit; characterized by an inserted drug type information acquisition unit that acquires the drug type information of the drugs inserted into a packaging machine which packages the drugs in the packet; an inserted drug type error determination unit that determines whether the type of the drug inserted into the packaging machine is correct, on the basis of at least the dispensing information and the drug type information; a mix-up determinability determination unit that determines whether the occurrence or non-occurrence of a mix-up in which a different type of drug is put in the packet, instead of the drug to be put in the packet, can be determined, on the basis of at least the dispensing information and the drug type information; and a packaging error determination unit that determines whether the drugs packaged in each packet are correct, on the basis of the determination result of the number-by-appearance error determination unit and the determination result of the mix-up determinability determination unit, and determines that the drugs are correct when the number-by-appearance error determination unit determines that the number of drugs is correct and the mix-up determinability determination unit determines that the occurrence or non-occurrence of the mix-up can be determined. a dispensing information acquisition unit that acquires dispensing information of drugs packaged in a packet; a number-by-appearance information acquisition unit that acquires number-by-appearance information indicating the number of drugs for each outward appearance, which correspond to each dose and are packaged in each packet, on the basis of at least the dispensing information and a drug type information; an imaging unit that captures an image of the drugs corresponding to each dose; a number-by-appearance counting unit that counts the number of drugs for each outward appearance which correspond to each dose, on the basis of the image of the drugs captured by the imaging unit; a number-by-appearance error determination unit that determines whether the number of drugs for each outward appearance which correspond to each dose is correct, on the basis of the number-by-appearance information and the counting result of the number-by-appearance counting unit; characterized by an inserted drug type information acquisition unit that acquires the drug type information of the drugs inserted into a packaging machine which packages the drugs in the packet; an inserted drug type error determination unit that determines whether the type of the drug inserted into the packaging machine is correct, on the basis of at least the dispensing information and the drug type information; a mix-up determinability determination unit that determines whether the occurrence or non-occurrence of a mix-up in which a different type of drug is put in the packet, instead of the drug to be put in the packet, can be determined, on the basis of at least the dispensing information and the drug type information; and a packaging error determination unit that determines whether the drugs packaged in each packet are correct, on the basis of the determination result of the number-by-appearance error determination unit and the determination result of the mix-up determinability determination unit, and determines that the drugs are correct when the number-by-appearance error determination unit determines that the number of drugs is correct and the mix-up determinability determination unit determines that the occurrence or non-occurrence of the mix-up can be determined.