Patent ID: 7578943

Claim:
A producing method for a liquid discharge head including plural pressure generating chambers respectively provided with pressure generating elements, plural nozzle holes respectively communicating with the plural pressure generating chambers and adapted to discharge a liquid, and a reservoir with which the plural pressure generating chambers commonly communicate respectively through communicating parts, the reservoir being provided with a shallow portion having a depth less than a depth of a communicating portion in the reservoir, the communicating portion being in a vicinity of at least one of the communicating parts, the method comprising: a step of executing an etching in a portion corresponding at least to the communicating portion on one of two principal planes of a substrate, thereby forming a predetermined recessed portion on the one of the principal planes; a step of executing an etching in a portion corresponding to the reservoir and the predetermined recess portion, on the one of the two principal planes of the substrate, thereby forming a recessed portion constituting the reservoir having the shallow portion on the one of two principal planes; and a step of executing an etching in a portion corresponding to the pressure generating chamber on the other of the two principal planes, thereby forming a recessed portion constituting the pressure generating chamber, which communicates with the at least one of the communicating parts on the other of the two principal planes.