PROBLEM TO BE SOLVED: To provide a metal container lid which is structured so that a lowermost part of a skirt wall is caulked with respect to the jaw part of a container and capable of surely preventing intrusion of foreign matter, etc. or unauthorized transactions such as the extraction of contents and replacement to another contents, or the like, without the increase of material and cost.SOLUTION: A metal container lid 100 includes a top surface wall 110 and a cylindrical skirt wall 120 suspended from a peripheral edge of the top surface wall 110 and having a tamper-evident mechanism and is attached to a container 101 in such a manner that the lower part of a tamper-evident band part 123 is caulked. An opening prevention auxiliary weakening part 125 is provided in a bent part 124 in caulking or below from the bent part 124.
