Method for manufacturing ink jet recording head using thermohardening filler

A method for manufacturing an ink jet recording head provided with a recording elemental substrate having a discharge port group for discharging ink, an electric wiring substrate electrically connected with the recording elemental substrate, and a supporting member for holding and fixing the recording elemental substrate and the electrical wiring substrate, comprising the steps of:

• injecting thermohardening filler into a filler retaining portion communicating with a sealing area requiring sealing;
• filling the sealing area with the thermohardening filler injected into the filler retaining portion by heating the filler to flow;
• and
• hardening the filled thermohardening filler,
• wherein the sealing area is formed by the supporting member, the recording elemental substrate, and the electric wiring substrate, and
• wherein the filler retaining portion is a stepping portion of the recording elemental substrate and the supporting member for supporting the recording elemental substrate, and is a portion adjacent to a side face of the recording elemental substrate having no electrode terminals arranged therefor.