The present invention relates to A pressure-sensitive adhesive tape or sheet comprising a substrate comprising a nonwoven fabric and a pressure-sensitive adhesive layer disposed on at least one side of the substrate, the pressure-sensitive adhesive tape or sheet having a plurality of penetrating pores which penetrate the substrate and the pressure-sensitive adhesive layer so that corners of the penetrating pores are aligned in at least one direction, the penetrating pores having a flat polygonal shape, and in which, the penetration pore has, among the corners aligned in one direction, at least two corners facing each other in one direction each having an angle of less than 90°.
