| 摘要 |
A base member for use for manufacturing an ink jet recording head, wherein the ink jet recording head includes a supply port for receiving liquid from an outside, an ejection outlet for ejecting the liquid, a liquid flow path, in fluid communication with the ejection outlet, for directing the liquid supplied from the supply port to the ejection outlet, an ejection pressure generating portion for generating pressure for ejecting the liquid, the generating portion being disposed at a part of the liquid flow path, and wherein the supply port is formed as a through-opening in a substrate on which an ejection pressure generation element constituting the ejection pressure generating portion, the base member includes a recessed portion formed in such a side of the substrate as is provided with the ejection pressure generation element, the recessed portion extends from an edge of the supply port to a neighborhood of the ejection pressure generation element; and a protection layer provided at least on a surface of a portion of the substrate surface constituting the recessed portion.
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