An incoming/outgoing goods management system showing the stock status of goods and the details of the incoming/outgoing goods work without delay. The gross weight of goods, and an unopened goods package and open goods package which store the goods measured by a weight sensor, and an ID tag attached to a package and ID tag carried by a worker read by an ID reader, are combined with various information stored by a storage part 145, so the incoming/outgoing goods work situation or inventory status can be appreciated promptly, a detailed check of compliance between plans and achievement can be performed, and required working command and warnings can be given to workers and managers so as to streamline the work.