Burner case production method and burner case

A burner case production method, comprising:

• a temporary fixing procedure to temporarily fix a first member and a second member after the first member and the second member are combined, the first member and the second member constituting the burner case;
• and
• a main fixing procedure to actually fix the first member and the second member after the temporary fixing procedure,
• wherein the second member has a facing portion facing a caulking portion of the first member and an extending portion extending from the facing portion, a part of the extending portion in longitudinal direction constituting a claw portion,
• in the temporary fixing procedure a temporary caulking operation is executed in such a manner that the claw portion is bent and the caulking portion is held between the claw portion and the facing portion,
• in the main fixing procedure a main caulking operation is executed in such a manner that the extending portion excluding the claw portion is also bent and the caulking portion is held between the extending portion and the facing portion, and
• the claw portion of the extending portion is sectioned from the extending portion by a cutout concave portion extending inward from an outer edge of the extending portion in width direction.