Patent ID: 7849325

Claim:
A biological information matching device that recognizes authorized persons based on unique identifiers allocated to the authorized persons and biological information of the authorized persons, the biological information matching device comprising: a database of the unique identifiers and biological information of the authorized persons; a temporary storage unit configured to store therein a portion of the database temporarily; an identifier reader configured to read an identifier of a person from an RFID IC tag carried by the person intermittently at predetermined interval; a retrieving unit configured to retrieve from the database biological information corresponding to the identifier of the person upon receiving the identifier from the identifier reader, and to write retrieved biological information in the temporary storage unit, the retrieving unit deleting the oldest biological information from the temporary storage unit when storing new biological information in the temporary storage unit; and a matching unit that checks if biological information acquired from the person matches with the biological information in the temporary storage unit instead of the database to thereby decide whether the person is the authorized person.