A printing apparatus includes a transfer device that transfers a printing medium in a transfer direction, a platen having a support surface that supports the printing medium thereon, a liquid ejection head that ejects an ink onto the printing medium on the support surface, and a heating device that heats the printing medium. The transfer device includes a plurality of driven rollers. The support surface of the platen has a plurality of suction holes that suck the printing medium on the support surface. The support surface includes first portion extending in the transfer direction corresponding to extension lines extending in the transport direction from the portions between each driven roller, and second portions other than the first portions. The first portions are high-density regions where the suction holes are arranged at high density, and the second portions are low-density regions where the suction holes are arranged at low density.