A medical treatment instrument temperature information management device (50) includes: a wireless tag (10) that is disposed at an instrument (110)； and a reader-writer (20) as a reading unit that reads data from the wireless tag (10). The wireless tag (10) includes: a temperature sensor (13)； and an IC chip including a storage part (11b). The wireless tag (10) makes the storage part (11b) store therein temperature information on temperature of the instrument (110) based on a value detected by the temperature sensor (13). This makes it possible to manage the temperature information on temperature of the instrument such as a medical treatment instrument with reliability.
