Method for manufacturing metal bottle, and metal bottle

A method for manufacturing a metal bottle having a mouthpiece part in an upper part of a bottomed cylindrical bottle body, the method comprising:

• forming a screw part on the mouthpiece part and, after formation of the screw part, forming a curl part at a tip of the mouthpiece part, wherein,
• during the formation of the screw part, a height of a first-stage screw thread from a tip side in a complete screw part and a height of a second-stage screw thread from the tip side are substantially equal and a distance between an apex part of the first-stage screw thread and a bottle axis is formed smaller than a distance between an apex part of the second-stage screw thread and the bottle axis and,
• after the formation of the curl part, a distance between the apex part of the first-stage screw thread and the bottle axis and a distance between the apex part of the second-stage screw thread and the bottle axis are formed substantially equal.