Driving method of liquid feeding apparatus

A driving method of a liquid feeding apparatus including a liquid chamber configured to store a liquid, and a driving element provided in the liquid chamber and configured to circulate a liquid stored in the liquid chamber to an external unit by expanding and contracting a capacity of the liquid chamber along with application of a voltage, the method comprising:

• controlling the voltage applied to the driving element in such a way as to repeat a first period in which the voltage is changed from a first voltage to a second voltage and a second period which is a longer period than the first period and in which the voltage is changed from the second voltage to the first voltage;
• and
• controlling the voltage applied to the driving element such that an inflection point is provided in each predetermined interval during the first period based on a Helmholtz vibration period unique to the liquid feeding apparatus.