Patent ID: 8636336

Claim:
A liquid discharge head comprising: a recording element substrate having a discharge-port surface having a discharge port discharging a liquid, side surfaces on sides of the discharge-port surface, and a back surface of the discharge-port surface having an opening of an ink supplying port supplying ink to the discharge port; a supporting member having a depression accommodating the recording element substrate, the depression including a supporting part disposed at a bottom surface of the depression and supporting the recording element substrate with an adhesive and an opening of an ink channel communicating with the ink supplying port; and an electric wiring substrate disposed on a surface of the supporting member having the depression and having an electric connecting part connecting with a side of the discharge-port surface of the recording element substrate, wherein the side surfaces of the recording element substrate includes a first side surface on a side of the discharge-port surface having the electric connecting part and a second side surface on a side of the discharge-port surface not having the electric connecting part, wherein the bottom surface of the depression has a groove part extending along the second side surface between the supporting part and a sidewall of the depression, and wherein a space between the first side surface and the sidewall of the depression is sealed together with the electric connecting part with a sealant, at least a part of the second side surface is exposed and not covered with the sealant, and at least part of a surface of the adhesive facing the sidewall of the depression is sealed with the sealant.