Manufacturing method for cylinder head

A manufacturing method for a cylinder head comprising the steps of:

• preparing a cylinder head material having in the same plane a matching surface with a cylinder block and a wall surface of an engine combustion chamber, wherein the wall surface has at least three port holes that include an intake port and an exhaust port;
• attaching the cylinder head material to a masking member that is configured to mask a non-film formation region of the wall surface and the matching surface with the cylinder block;
• after the attachment of the masking member, injecting film material particles onto the matching surface with the cylinder block to form a heat shield film;
• and
• detaching the masking member from the cylinder head material after the formation of the heat shield film,
• wherein the masking member comprises:
• a matching surface mask portion that is configured to mask the matching surface with the cylinder block;
• port hole mask portions that are configured to link to the matching surface mask portion directly and to mask openings of the port holes;
• and
• a between openings mask portion that is configured to mask at least one narrow region which is a sandwiched region between openings of two adjacent port holes and also is the shortest distance region between opening edges of the adjacent port holes, and is configured to link directly to both of the port hole mask portions that mask the openings of the adjacent port holes, respectively.