A label L is formed to include a first label area L1 and a second label area L2 which is folded back to a rear surface side of the first label L1. The second label area L2 is stuck to an adhesive layer 11 side of the first label area L1 so that a printed surface thereof is positioned at an adherend side and when a part of the adhesive layer 11 is stuck to the adherend, a state that the printed surface is concealed is maintained. Confirmation and storage of the printed information on the second label area L2 is carried out through tearing off along tear-off lines 13, 14, 15 and 17.