Patent ID: 8138920

Claim:
A tag reader for detecting the number of goods via a tag attached to the goods and by counting the number of tags read by a reader/writer, comprising: a determination unit to determine whether reading of the tag is properly conducted or not by comparing a quantity of goods mounted on a goods mounting unit to which a tag including quantity information relating to the quantity of mounted goods is attached and quantity information of the tag attached to the goods mounting unit, wherein the goods mounting unit includes a plurality of tags attached thereto that stores a sequential number which coincides with the number of goods according to an order of mounting of the goods, and that is blocked when the goods are mounted in a mounting position for the goods, and the determination unit recognizes a minimum value of the information stored in the tag at the mounting position for the goods as a quantity of goods actually mounted, and determines whether the reading of the tag is properly conducted or not by comparing the quantity of tags attached to the goods with the quantity of goods actually mounted.