According to one embodiment, a tablet printing apparatus includes: a conveyor configured to convey tablets sequentially supplied thereto while sucking and holding the tablets by a suction chamber 14; a print head located to face the conveyor and configured to elect ink to the tablet conveyed by the conveyor to perform printing; and partition walls 144, 144 and suction paths 1421, 1422 that serve as a suction force adjusting device configured to reduce a suction force applied to the tablet at a conveyance position facing the print head to be lower than a suction force applied to the tablet at conveyance positions in front of and behind the conveyance position.