To provide a cutter for pressure-sensitive adhesive tape. which can generate a folded end certainly when tape is cut and allows simple replacement of adhesive tape.

On the base 1, a cutter is equipped with a supporting means 2 to hold a pressure-sensitive adhesive tape T rotatably and a cutting means 3 to cut a tape 18, where a deforming member 15 is installed upright having a projection to be put in pressure contact with the adhering surface of the adhesive tape T for giving a certain deformation in the longitudinal direction of the tape 18. The base end of a cutter element 16 having a blade 22 is pivoted beside the deforming member 15 in such a way as upright, rotatably and facing outward, and a cutting means 3 formed by elastically energizing the cutter element 16 by an elastic member 9 is provided in a position beside the deforming means 15.