| 摘要 |
<p>A bottle cap has an outer peripheral surface formed about its rotation axis. The outer peripheral surface has an elastically deforming section and a non-elastically deforming section that are arranged about the rotation axis so as to be adjacent to each other. The elastically deforming section is elastically deformed and depressed toward the rotation axis when the outer peripheral surface is pressed, and a step is formed between the elastically deforming section and the non-elastically deforming section when the elastically deforming section is elastically deformed and depressed. The bottle cap facilitates opening and closing of a bottle without an increase in cost and without a decrease in safety of human beings, objects, and the content of the bottle.</p> |
