An outgoing path port and a returning path port of a circulation path are at a position that is lower than a printing head. The outgoing path port and a discharge port of a discharge path are at a position that is lower than the returning path port. When ink droplets are ejected from the printing head, ink is pumped from a main tank to a sub tank using a supply pump, and ink is pumped from the outgoing path port to the printing head using a circulation pump with an opening and closing valve open and an opening and closing valve closed. In a case where discharge of ink in the sub tank and a circulation path is instructed before replacing of an ink unit, ink is pumped from the outgoing path port to a junction side using the circulation pump with both of the valves open.