Ink jet recording head, manufacturing method thereof, and electron device

摘要

An ink jet recording head includes a substrate, having a front surface and a back surface opposite from the front surface, provided above the front surface with an energy generating element for generating energy used for ejecting ink; an ink supply port provided so as to penetrate between the front surface and the back surface of the substrate; a first layer provided on or above the front surface of the substrate; a protection layer which is provided so as to coat a wall of the substrate defining the ink supply port and which continuously extends onto the first layer; and a second layer located above the front surface of the substrate and including a portion provided on the protection layer and another portion provided on the first layer by penetrating through the protection layer.