To surely cut off a dirty adhesive tape to tear off the dirty adhesive tape.

An adhesive tape 11 whose adhesive layer is positioned to be the front face is formed with a half cut C cut line at each predetermined length along the width direction of the tape 11. A used adhesive tape 11 is cut off along the cut line to expose a new adhesive layer for use. The depth of the half cut C is enough to reach a lower layer sheet 14 from an adhesive layer 17 side and cuts the adhesive layer 17 and an upper layer sheet 15 but does not cut the lower layer sheet 14 and a separation layer 18.