A tape printing apparatus includes a cartridge mounting portion in which a tape cartridge is mounted, the tape cartridge including a first case that has a peripheral wall portion in which a first hook projects from a tip end surface, and for which, on an outer peripheral surface of the peripheral wall portion, depths of recessed parts of a first base-end-side part, which is a site that is further on a base end side than a base end portion of the first hook, are different for a plurality of types of tape cartridge, and a second case that has a first hook receiving portion with which the first hook engages, and a first base-end-side part detection sensor, an output of which changes depending on the depths of the recessed parts at the first base-end-side part in a state in which a tape cartridge is mounted in the cartridge mounting portion.