An adhesive tape (1) comprises a base material layer, an adhesive layer, and a release material layer, wherein two edges (11 and 12) extending in the longitudinal direction of the adhesive tape include parallel portions (11a and 12a), the length of one of the two edges (11 and 12) is greater than the length of the other, the ends of the two edges (11 and 12) are connected to the ends of two other edges (13 and 14), and two angles formed between the longer edge of the two edges (11 and 12) extending in the longitudinal direction and the two other edges (13 and 14) are acute angles.