Manufacturing method for structure and manufacturing method for liquid ejecting head

A manufacturing method for a liquid ejecting head including:

• a substrate provided with an ejection energy generating element for generating energy for ejecting liquid;
• a liquid supply port;
• a liquid chamber;
• a channel communicating with the liquid supply port;
• and
• an ejection port forming member having an ejection port communicating with the channel formed on the ejection port forming member,
• the manufacturing method comprising:
• a first step of attaching a dry film having flexibility onto the substrate in such a manner as to cover an opening of the liquid chamber;
• and
• a second step of hardening the dry film attached onto the substrate,
• wherein in the first step, the dry film is attached onto the substrate so that a closed space is formed inward of the liquid chamber, and an entire non-attached portion of the dry film covering the opening is slacked inward of the liquid chamber from the opening, and
• wherein the first step is performed in an environment of a lower pressure than in the second step.