This invention provides an
inventory management system that reduces the burden of
system input that occurs when packaging is changed, thereby improving operational efficiency. [Solution] An
inventory management device equipped with a
control unit, the
control unit registers a product master that associates product information and bulk information, registers a specification master that associates bulk information, inspection items, and specification values, registers manufacturing performance data that associates product information,
lot number, production quantity, and inspection status, creates
inventory data that associates product information, bulk information,
lot number, inspection status, and packaging information based on the product master, specification master, and manufacturing performance data, and updates the
inventory data by changing the packaging information in the
inventory data from the packaging before the change to the packaging after the change when the packaging corresponding to the product information and
lot number is changed.