Patent ID: 8037603

Claim:
A producing method for an ink jet head including plural discharge ports for discharging ink and plural flow paths communicating with the discharge ports, the producing method comprising: forming a first flow path forming member of photosensitive resin in a portion constituting a flow path side wall, which constitutes at least a partitioning portion between plural flow paths on a substrate and functions as a wall of at least one of the flow paths; forming a pattern as a mold for the at least one flow path, wherein the pattern is formed over the substrate and a first portion of the first flow path forming member that functions as the wall of the flow path, and a second portion of the first flow path forming member is not covered with the pattern; forming a second flow path forming member of photosensitive resin on the first flow path forming member and the pattern, wherein the second flow path forming member functions as a wall of the at least one flow path, the second flow path forming member being formed of a material corresponding to the first flow path forming member; forming the discharge port in the second flow path forming member; and forming the at least one flow path by removing the pattern.