To take an appropriate medical treatment for a patient.

This tag is provided with a first recording area AR1 where character information for specifying the patient is recorded and a second recording area AR2 where image information for visually recognizing the patient is recorded. In this case, since the image information for visually recognizing the patient is recorded in the second recording area AR2, the patient and a transfusion liquid are accurately made to correspond, the appropriate medical action is taken corresponding to the patient and medical accidents are prevented from happening.