In order to enable easily opening of a bag by sliding both surfaces of the bag in the length direction of a zipper tape regardless of the rigidity of the zipper tape, a bag with attached zipper tape is provided which comprises: a bag body having at least one pair of opposite surfaces; and an elongate zipper tape comprising, in the cross-sectional shape, a first and a second base each bonded to the pair of facing surfaces, and a first and second engaging part which protrude from the first and second bases, respectively, and engage with each other, wherein a middle hinge is formed in at least one position in the length direction.