Device for assisting the application of adhesive tape and adhesive tape application method

A device for assisting application of an adhesive tape to a predetermined position in the width direction, on an adherend surface having a neighboring surface linked with thereto via a folding line of an adherend member, said device comprising:

• a pressing member consisting of a first pressing portion being capable of pressing to the adherend surface, and a second pressing portion connected to the first pressing portion and being capable of pressing to the neighboring surface when the first pressing portion is attached pressingly to the adherend surface;
• a tape guide member for guiding the adhesive tape mounted directly or indirectly on the pressing member;
• and
• a holding member connected to the pressing member for supporting the pressing member in such a manner that an operator can move the pressing member with the first pressing portion pressing to the adherend surface and the second pressing portion pressing to the neighboring surface;
• wherein the tape guide member includes a tape position defining member for defining the position of the adhesive tape in the width direction relative to the pressing member, an unapplied tape guide member for guiding the unapplied portion of the tape in a predetermined direction, and a liner guide member for guiding the liner separated from the adhesive tape in another predetermined direction.