To automatically cut out a drawn adhesive tape by providing a cutter adapted to elevate in response to the backward movement of an operation knob provided on the upper surface of a barrel of a case main body.

In cutting an adhesive tape T drawn out by a drawing means, an operation knob 310 on the upper surface of a barrel of a case main body 100 is moved backward by the thumb. A vertical projection of a cam 320 is engaged between a pair of hanging projections 311 of the operation knob 310, so that the cam 320 is turned clockwise taking a pin 105 as a middle point. A pair of horizontal projections of the cam 320 push up the base of a lever 330 against the elastic force of a fourth torsion spring 336, the lever 330 is turned counterclockwise taking the shaft projection 335 as a middle point, and a cutter 340 fixed to the tip of the lever 330 is lowered to cut the adhesive tape T. At this time, by a torsion spring 332 mounted on the lever 330, a pressing plate 350 is also lowered to firmly clamp the adhesive tape T by the lower end of the pressing plate 350 and the lower edge of a drawing port 120.