Abstract: An adhesive tape applicator comprises a holding means 3 which slidably holds a door sash frame of an automobile, the holding means 3 comprising a guide means 4 which slidably holds the door sash frame and guides the applicator along the door sash frame, a pressing portion 7 which presses the adhesive tape and an adhesive tape guide means which separates a release liner from the adhesive tape the leads the adhesive tape to a pressing portion 6, the adhesive tape guide means comprising a tape passage which is disposed at the front side of the pressing portion 6 in the sliding direction of the applicator and extends from the vicinity of the pressing point of the pressing portion 6 to a rear position in the pressing direction and a movable part 9 which is slidably supported in the sliding direction of the applicator or the opposite direction across the tape passage. Thus, the present invention is capable of stably and accurately applying the adhesive tape at a high speed and improving operability.