A liquid ejection head comprising an element substrate including an ejection opening array in which multiple ejection openings through which liquid is ejected are arranged along a first direction, multiple pressure chambers communicating with the respective ejection openings, heat generating elements capable of generating thermal energy for ejecting liquid supplied to the pressure chambers through the ejection openings, a first supply path extending in the first direction and communicating with the pressure chambers, a first collection path extending in the first direction and communicating with the pressure chambers, multiple liquid supply ports communicating with the first supply path at different positions along the first direction, and a liquid collection port communicating with the first collection path, wherein the liquid ejection head is configured such that a liquid that has flown into the liquid supply ports flows into the first supply path and then flows via the pressure chambers and the first collection path into the liquid collection port, characterized in that at least a liquid supply port (21a1, 21a2) of the liquid supply ports located at an end portion in the first direction has an opening area larger than the opening area of the liquid collection port. an element substrate including an ejection opening array in which multiple ejection openings through which liquid is ejected are arranged along a first direction, multiple pressure chambers communicating with the respective ejection openings, heat generating elements capable of generating thermal energy for ejecting liquid supplied to the pressure chambers through the ejection openings, a first supply path extending in the first direction and communicating with the pressure chambers, a first collection path extending in the first direction and communicating with the pressure chambers, multiple liquid supply ports communicating with the first supply path at different positions along the first direction, and a liquid collection port communicating with the first collection path, wherein an ejection opening array in which multiple ejection openings through which liquid is ejected are arranged along a first direction, multiple pressure chambers communicating with the respective ejection openings, heat generating elements capable of generating thermal energy for ejecting liquid supplied to the pressure chambers through the ejection openings, a first supply path extending in the first direction and communicating with the pressure chambers, a first collection path extending in the first direction and communicating with the pressure chambers, multiple liquid supply ports communicating with the first supply path at different positions along the first direction, and a liquid collection port communicating with the first collection path, wherein the liquid ejection head is configured such that a liquid that has flown into the liquid supply ports flows into the first supply path and then flows via the pressure chambers and the first collection path into the liquid collection port, characterized in that at least a liquid supply port (21a1, 21a2) of the liquid supply ports located at an end portion in the first direction has an opening area larger than the opening area of the liquid collection port.