A method of sticking each of identification information labels (50) indicating donor-identification information (BC) that is to be assigned to each donor on corresponding one of a plurality of blood collection tubes (30) for containing a medical fluid of the each donor, the method includes: arranging the plurality of blood collection tubes (30) side by side； and sticking the separably united identification information labels (50) as many as the blood collection tubes (30) on the plurality of blood collection tubes (30) arranged side by side.
