A product inspection device can confirm the presence of a tag to which a product is not attached or a product to which a tag is not attached when information is to be read from an electronic tag attached to a packaged product and an inspection is to be conducted. The device comprises a scale 2 that determines the weight of a packaged product 14 or the total weight of a plurality of packed products 14 in a state in which one or a plurality of products 11 to which a non-contact, wireless electronic tag 7 is attached are packed; and a read/write device 3 for the electronic tag 7 attached to the plurality of products 14. The packaged product or products are inspected based on the information on the weight of the product or products stored in the electronic tag 7.