A tape cartridge 2 includes a tape core 21b rotatably supported in a cartridge case 25 and houses a print tape 21a wound around the tape core 21b such that the print tape 21a can be unwound. The tape core 21b includes a core body 26 with the print tape 21a wound around an outer peripheral surface of the core body 26, a disk-like rib 27 provided at a middle portion in an axial direction of an inner peripheral surface of the core body 26, and a shaft hole 28 formed at an axis center of the rib 27. The cartridge case 25 includes a shaft support 41 that is inserted into the shaft hole 28 and rotatably supports the tape core 21b, and a rotation guide 42 that slides on the inner peripheral surface of the core body 26.