| 摘要 |
A ball chain including metal balls with a small wall thickness and can withstand a large tensile load are provided. A method of manufacturing the same includes rounding a piece of metal to form rotation-axis symmetric bodies 22 and connecting the rotation-axis symmetric bodies 22 in a chain-like manner with connecting shafts. Each of the connecting shafts has connecting heads on both end portions. Each of the rotation-axis symmetric bodies 22 has a butt seam 24 in a direction of a rotation axis of the rotation-axis symmetric body and a weld part 25 at at least one part of the butt seam 24.
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