Patent ID: 7607547

Claim:
A container cap comprising a top panel wall and a skirt wall of a cylindrical shape hanging down from the circumferential edge of the top panel wall, the skirt wall being sectioned into a main portion over a weakened line that is extending in the circumferential direction and can be broken and a tamper-evidence hem under the weakened line, and the circumferential wall portion of at least the main portion of the skirt wall having linear protuberances protruding on the outer side of the circumferential wall portion and extending in the up-and-down direction of the main portion in a plural number along the whole circumferential direction of the main portion, wherein the protuberances include large protuberances having a large height and small protuberances having a height of protrusion from the outer surface of the circumferential wall portion smaller than that of the large protuberances, and the main portion has large protuberance regions forming a plurality of large protuberances and small protuberance regions forming a plurality of small protuberances, the large protuberance regions and the small protuberance regions being alternately arranged in the circumferential direction of the main portion, and wherein protuberances formed on the small protuberance regions of the container cap are such that the small protuberances at positions close to the middle side of the small protuberance regions in the circumferential direction have a height of protrusion from the outer surface of the circumferential wall portion smaller than the height of protrusion of the small protuberances positioned on the outer sides.