To provide a tape sticking device capable of easily and accurately sticking a corresponding adhesive tape on a tape adhesion surface of a work in which a width dimension is continuously varied.

The tape sticking device is provided with a first guide roller 17 mounted to a main frame; an energizing means 25 for energizing a sub-frame movably mounted to the main frame to the first guide roller 17 side; a second guide roller 26 mounted to the sub-frame 20 so as to be opposed to the first guide roller 17 and movably retaining the frame along a tape adhesion surface 4 with the first guide roller 17; a press roller 12 which is mounted to the main frame, on which an adhesive tape is wound and which rolls in the pressed state to the tape adhesion surface 4; a press plate 11 of which a base end part is turnably mounted to the main frame; and a press plate retaining means for retaining the press plate 11 so as to form a space part 37 for guiding an adhesive tape with a peeling off material with the press roller 12.