A tablet cartridge includes a rotor, a tablet stopper, a case, and a stopper cover. The rotor has a plurality of guide-teeth protruding at regular intervals along a circumference of the rotor, and has tablet insertion grooves formed between the guide-teeth. The tablet stopper is disposed to close a top of one of the tablet insertion grooves. The case includes a dispensing opening formed at a position on a lower portion of the rotor accommodating portion, corresponding to a position of the tablet stopper, and a stopper insertion hole of a length that allows for the tablet stopper to adjust its height while being inserted into the stopper insertion hole. The stopper cover is coupled to the case to close the stopper insertion groove, and has the tablet stopper mounted thereon at an adjusted height.