Atape cartridge which is mountable in a tape printing apparatus, comprising: a cartridge case, a tape-shaped member which has a mount tape and a printing tape releasably stuck to the mount tape, and is contained in the cartridge case, an ink ribbon which is contained in the cartridge case, a roller which is contained rotatably in the cartridge case, feeds the tape-shaped member outside the cartridge case by rotation, and is movable to a tape feeding upstream side in association with a retracting of the tape-shaped member into the cartridge case, a retracting prevention part which is cantilevered by the cartridge case on the tape feeding upstream side from the roller so as to be elastically bent by receiving a tension of the fed tape-shaped member, and holds the tape-shaped member together with the roller moved to the tape feeding upstream side in association with the retracting of the tape-shaped member into the cartridge case, and a ribbon guide part which is provided in the retracting prevention part in a direction in which the retracting prevention part is bent by the tension of the tape-shaped member, and guides the ink ribbon fed between the ribbon guide part and the retracting prevention part, wherein the retracting prevention part includes a tape holding part which holds the tape-shaped member together with the roller, and an upstream base end provided in a base end of the tape holding part on the tape feeding upstream side of the tape holding part, and in a position of being overlapped with the ribbon guide part when viewed from the bending direction, characterized in that a protruding height of the tape holding part is almost two-thirds of a tape width excluding the detection protrusion, and the protruding height of the upstream base end is almost a half of the tape width excluding the detection protrusion. a cartridge case, a tape-shaped member which has a mount tape and a printing tape releasably stuck to the mount tape, and is contained in the cartridge case, an ink ribbon which is contained in the cartridge case, a roller which is contained rotatably in the cartridge case, feeds the tape-shaped member outside the cartridge case by rotation, and is movable to a tape feeding upstream side in association with a retracting of the tape-shaped member into the cartridge case, a retracting prevention part which is cantilevered by the cartridge case on the tape feeding upstream side from the roller so as to be elastically bent by receiving a tension of the fed tape-shaped member, and holds the tape-shaped member together with the roller moved to the tape feeding upstream side in association with the retracting of the tape-shaped member into the cartridge case, and a ribbon guide part which is provided in the retracting prevention part in a direction in which the retracting prevention part is bent by the tension of the tape-shaped member, and guides the ink ribbon fed between the ribbon guide part and the retracting prevention part, wherein the retracting prevention part includes a tape holding part which holds the tape-shaped member together with the roller, and an upstream base end provided in a base end of the tape holding part on the tape feeding upstream side of the tape holding part, and in a position of being overlapped with the ribbon guide part when viewed from the bending direction, characterized in that a protruding height of the tape holding part is almost two-thirds of a tape width excluding the detection protrusion, and the protruding height of the upstream base end is almost a half of the tape width excluding the detection protrusion.