There is provided a printing apparatus including: a platen configured to convey, in a conveying direction, a printing medium to be subjected to a pretreatment for applying a pretreatment agent before or after the platen is located at a set position; an ejection head having a nozzle surface provided with a nozzle and configured to perform an ejection process of ejecting a liquid from the nozzle onto the printing medium conveyed by the platen at a printing position; a cap configured to cover the nozzle surface; and a cap switching mechanism configured to switch a position of the cap between a capping position where the nozzle surface is covered with the cap and an uncapping position where the nozzle surface and the cap are separated from each other, wherein the cap switching mechanism moves the cap to the uncapping position after a printing start instruction is received.