According to one embodiment, a tablet printing apparatus includes: a conveyor belt including a suction hole to suck a tablet; and an ink jet print head configured to perform printing on the tablet; wherein the conveyor belt further includes a plurality of protrusions formed around the suction hole and configured to support the tablet in contact with the tablet, and a recess formed between the protrusions and communicated with the suction hole, each of the protrusions has a bottom surface, an upper surface, area of which is smaller than that of the bottom surface, and a side surface having an inclined surface, the protrusions support the tablet such that a gap is formed between a surface of the tablet on conveyor belt side and the suction hole, and a suction force is applied to the gap and space of the recess through the suction hole to suck the tablet.