Droplet ejection device

A droplet ejection device comprising:

• a head that ejects a liquid charged therein;
• a supply flow path that supplies the liquid to the head and for which a first depressurization threshold is specified in advance;
• a drainage flow path that drains the liquid charged into the head and for which a second depressurization threshold is specified in advance;
• a supply pump that sucks the liquid, pressurizes the sucked liquid and supplies the sucked liquid to the head via the supply flow path, and that keeps a pressure of liquid in the supply flow path near to a predetermined supply flow path target pressure;
• a drainage pump that sucks and drains the liquid via the drainage flow path, and that keeps a pressure of liquid in the drainage flow path near to a predetermined drainage flow path target pressure;
• and
• a pressurizer that, if the pressure of liquid in at least one of the supply flow path and the drainage flow path falls to less than or equal to the depressurization threshold specified in advance for that flow path, pressurizes the pressure of liquid in the flow path in which the pressure has fallen to less than or equal to the depressurization threshold.