The invention provides a packaging container provided with an inner tape which can seal, reliably from the underside, an opening formed in the top of the container and which can be easily and sharply broken near the edge of the opening when a pull tab is peeled off; a process for the production of the inner tape; and an inner tape for containers. A packaging container having an opening for fluid food in the top, which opening is protected with a pull tab from the upper side, and being provided with an inner tape which is fused to both the back surface in the periphery of the opening and the inside face of the pull tab to seal the opening from the underside, wherein the inner tape comprises a linear low-density polyethylene outer layer having a thickness of 3 to 7[mu]m, a low-density polyethylene interlayer having a thickness of 7 to 15[mu]m, an adhesive layer having a thickness of 3 to 6[mu]m, a barrier layer of an ethylene/vinyl alcohol copolymer having an ethylene content of 40 to 44 moles and a thickness of 4 to 7[mu]m, another adhesive layer having a thickness of 3 to 6[mu]m, another low-density polyethylene interlayer having a thickness of 7 to 15[mu]m, and another linear low-density polyethylene outer layer having a thickness of 3 to 7[mu]m.