Provided is a tape cartridge allowing rimless printing to be reliably performed on respective label portions. A tape cartridge installed in a tape printing apparatus includes: a label tape 101 having a plurality of label portions 105 provided along a tape length direction and a plurality of detection convex portions 109 provided along the tape length direction corresponding to the plurality of label portions 105; a cartridge case in which the label tape 101 is accommodated; and a platen roller 103 accommodated in the cartridge case and paying out the label tape 101 by rotation outside the cartridge case, wherein, in the tape length direction, detection tip-ends 109a serving as downstream-side ends of the detection convex portions 109 are positioned downstream of label tip-ends 105a serving as downstream-side ends of the label portions 105 in a paying-out direction of the label portion 105 at printing.