Liquid ejection device

A liquid ejection device comprising:

• an element substrate provided with an ejection port for ejecting a liquid;
• and
• a voltage application unit configured to apply a voltage to the element substrate, wherein
• the element substrate includes:
• a first layer provided with the ejection port on a surface thereof, and
• a second layer fixed to a back face of the first layer,
• the first layer is provided with a first channel communicating with the ejection port,
• the second layer is provided with a second channel communicating with the first channel, a heat element for ejecting the liquid from the ejection port, a first electrode covering a surface of the heat element on a side of the first layer, the first electrode being exposed to the first channel, and a second electrode exposed to the first channel at a position different from the first electrode, the second electrode not overlapping the heat element in a plan view,
• the second layer is at a potential of 0 V,
• the voltage application unit is configured to apply the voltage so that the first electrode is at a negative potential and the second electrode is at a positive potential, and
• the voltage application unit is configured to apply the voltage to the first electrode continuously from before the heat element begins to generate heat for ejecting the liquid from the ejection port and while the heat element is generating the heat.