Patent ID: 8827424

Claim:
A liquid ejection head comprising: a recording element substrate including an ejection port that ejects liquid, and an energy generating element that generates energy used to eject liquid; an electric wiring substrate including wiring for transmitting electric power for driving the energy generating element, and an opening that exposes the recording element substrate; a plurality of connecting portions that electrically connect the recording element substrate and the electric wiring substrate; a recess formed between the recording element substrate and the electric wiring substrate; and at least one groove formed in the bottom of the recess corresponding to at least one part where the connecting portions are formed, wherein the at least one groove includes a first portion formed along an arranging direction of the plurality of connecting portions, and a second portion formed in a direction intersecting with the arranging direction, wherein the width of the second portion of the at least one groove is larger than the width of the first portion of the at least one groove.