Patent ID: 7708390

Claim:
A liquid ejection head comprising: a pressure generating chamber forming plate that is made of a metal, that is formed with groove-like recess portions each of which extends in a first direction and which are aligned in two lines extending in a second direction perpendicular to the first direction and that is formed with communication ports penetrated in a plate thickness direction at one ends of the groove-like recess portions; a nozzle plate that is made of a metal, that is bored with nozzle openings at positions thereof in correspondence with the communication ports; and a sealing plate that is made of a metal, that is for sealing opening faces of the groove-like recess portions and that is bored with liquid supply ports at positions thereof in correspondence with other ends of the groove-like recess portions, wherein: the liquid ejection head is constituted by bonding the sealing plate to a side of the pressure generating chamber forming plate where the groove-like recess portions are formed, and also bonding the nozzle plate to an opposite side of the pressure generating chamber forming plate; and the pressure generating chamber forming plate is formed with a groove extending in the second direction between the two lines, the groove has a first portion and a second portion therein, and the first portion has a higher rigidity than the second portion.