To apply a releasing agent whenever it is necessary to eliminate adhesion of an adhesive in cutting a tape with an adhesive to prevent the edge from getting dull, by attaching a releasing agent keeper impregnated by a releasing agent in an envelope with an opening part at least on one end.

Opening parts 6 and 7 are formed on both ends of an envelope 1, and one opening part 6 is to be a storing port of an edged tool and the other an inserting port for a edge when a releasing agent is to be applied. For instance, one end of an elastic spacer 3 made of a plastic thin board is attached approaching the opening part 6, a sponge 2 as a releasing agent keeper on a face in the same side of the attached face of the spacer 3 on the other end is attached, and silicone oil is impregnated into the sponge 2 as a releasing agent. An abutting part is set on the end part in the opening part 7 side. When a releasing agent is applied, a pair of scissors is inserted into the opening part 7 and drawn out as is pressed to the sponge 2 to apply a releasing agent on the edge face.