| 摘要 |
A liquid ejection head includes a substrate including a liquid supply port and a plurality of ejection energy generating elements, disposed along the liquid supply port, and an ejection outlet plate including a plurality of ejection outlets, provided correspondingly to the plurality of ejection energy generating elements, and including a plurality of liquid flow passages, provided correspondingly to the plurality of ejection outlets, for establishing communication between the ejection outlets and the liquid supply port. The ejection outlet plate is provided with a hole portion formed to surround the liquid flow passages. The hole portion includes a plurality of first holes which are arranged in a line and which have opening edges having a shape without an acute angle and further includes a plurality of second holes having opening edges formed in a substantially sawtooth shape, with respect to a direction perpendicular to a surface of the ejection outlet plate.
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