A liquid ejection head comprising: an ejection port from which a liquid is ejected; a pressure chamber communicating with the ejection port; an ejection element configured to eject the liquid supplied to the pressure chamber from the ejection port; and a circulation path through which the liquid is circulated, wherein the circulation path comprises a supply channel through which the liquid is supplied to the pressure chamber; a collection channel through which the liquid is collected from the pressure chamber; a circulation pump which supplies the liquid collected through the collection channel to the supply channel; and a pressure adjustment unit (120, 150) configured to adjust a pressure on the liquid supplied to the supply channel, characterized in that a pressure P21 on the liquid supplied to the pressure chamber from the pressure adjustment unit (120, 150) through the supply channel in a state where the circulation pump is stopped, a pressure P22 on the liquid supplied to the pressure chamber from the pressure adjustment unit (120, 150) through the supply channel in a state where the circulation pump is driven, and a pressure loss ΔP from the pressure adjustment unit (120, 150) to the pressure chamber in the state where the circulation pump is driven have relationships of P 22 > P 21 and P 22 − ΔP < 0, wherein the pressure adjustment unit (120, 150) comprises a first pressure adjustment unit connected between the supply channel and an inlet through which the liquid supplied from a liquid supply source is introduced, wherein the first pressure adjustment unit has a first liquid chamber which stores the liquid supplied from the liquid supply source and the circulation pump, and a first adjustment mechanism which adjusts a pressure on the liquid supplied to the supply channel from the first liquid chamber, wherein the pressure adjustment unit (120, 150) further comprises a second pressure adjustment unit fluidly connected to the first liquid chamber, the collection channel, and the circulation pump, and wherein the second pressure adjustment unit has a second liquid chamber which stores the liquid supplied from the first liquid chamber and the collection channel, and a second adjustment mechanism which adjusts a pressure on the liquid supplied to the second liquid chamber. an ejection port from which a liquid is ejected; a pressure chamber communicating with the ejection port; an ejection element configured to eject the liquid supplied to the pressure chamber from the ejection port; and a circulation path through which the liquid is circulated, wherein the circulation path comprises a supply channel through which the liquid is supplied to the pressure chamber; a collection channel through which the liquid is collected from the pressure chamber; a circulation pump which supplies the liquid collected through the collection channel to the supply channel; and a pressure adjustment unit (120, 150) configured to adjust a pressure on the liquid supplied to the supply channel, a supply channel through which the liquid is supplied to the pressure chamber; a collection channel through which the liquid is collected from the pressure chamber; a circulation pump which supplies the liquid collected through the collection channel to the supply channel; and a pressure adjustment unit (120, 150) configured to adjust a pressure on the liquid supplied to the supply channel, characterized in that a pressure P21 on the liquid supplied to the pressure chamber from the pressure adjustment unit (120, 150) through the supply channel in a state where the circulation pump is stopped, a pressure P22 on the liquid supplied to the pressure chamber from the pressure adjustment unit (120, 150) through the supply channel in a state where the circulation pump is driven, and a pressure loss ΔP from the pressure adjustment unit (120, 150) to the pressure chamber in the state where the circulation pump is driven have relationships of P 22 > P 21 and P 22 − ΔP < 0, wherein the pressure adjustment unit (120, 150) comprises a first pressure adjustment unit connected between the supply channel and an inlet through which the liquid supplied from a liquid supply source is introduced, wherein the first pressure adjustment unit has a first liquid chamber which stores the liquid supplied from the liquid supply source and the circulation pump, and a first adjustment mechanism which adjusts a pressure on the liquid supplied to the supply channel from the first liquid chamber, wherein the pressure adjustment unit (120, 150) further comprises a second pressure adjustment unit fluidly connected to the first liquid chamber, the collection channel, and the circulation pump, and wherein the second pressure adjustment unit has a second liquid chamber which stores the liquid supplied from the first liquid chamber and the collection channel, and a second adjustment mechanism which adjusts a pressure on the liquid supplied to the second liquid chamber.