Patent ID: 7976139

Claim:
A liquid ejection head, comprising: a plurality of nozzles which eject liquid; a plurality of pressure chambers connected respectively to the plurality of nozzles; a common flow channel which is provided to be shared by the plurality of pressure chambers and has a plurality of supply flow channel connection ports and a plurality of circulation flow channel ports; a plurality of supply flow channels through which the liquid flows from the common flow channel to the plurality of pressure chambers via the plurality of supply flow channel connection ports; and a plurality of circulation flow channels through which the liquid flow from the plurality of pressure chambers to the common flow channel via the plurality of circulation flow channel ports, wherein the plurality of supply flow channel connection ports and the plurality of circulation flow channel ports are arranged so that a pressure differential of the liquid between the supply flow channel connection port and the circulation flow channel port which are connected to the same pressure chamber is equal in respect of all of the plurality of pressure chambers.