To provide a pressure sensitive adhesive tape sticking unit having the function of forming a fold line on the tip of a tape, by performing sticking work with one hand for cutting after directly sticking to a coating body, by stabilizing the tip of the tape with a novel structure, in the pressure sensitive adhesive tape sticking unit.

In this pressure sensitive adhesive tape sticking unit, a case 1 capable of rotatably installing a pressure sensitive adhesive tape roller and a tip part of the case 1 are projected in a substantially V shape, and a tape extracting port 2 is arranged there, and a pressing part 3 is arranged in front of its extracting port 2. A cutting blade 4 is arranged above the pressing part 3, and a unidirectional locking member formed of a rotary piece or an inclined face-shaped projecting member, is arranged on both side walls of the front case 1 from between the pressing part 3 and the cutting blade 4, and continuous work can be performed by stabilizing a tip part of the tape by the locking action of the unidirectional locking member.