In recent years, the thickness of the can lid and can barrel has been reduced in response to the demand for resource saving. Then, the use of a thin plate thickness increases the risk of a trouble called a cut seam that the leading end of the flange bites into the curled area of the can lid when the can lid is attached to the can barrel. When a cut seam occurs, there is a possibility that a sufficient sealing effect cannot be obtained on the formed double-wound portion. A flange tip region is provided in the opening, and the flange tip region has a curved surface with a can body inner line convex upward. This can prevent cut seams by easy machining of the flange tip region of the can barrel. Figure 6

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