To provide a novel and improved synthetic resin container lid which generates a desired sound by at least a part of a protruding piece is resiliently restored after it is fully resiliently deformed when the protruding piece moves from the lower face side to the upper face side of a stopper jaw portion even if a protruding length of the protruding piece is relatively short.

A synthetic resin container lid 2 includes a body 4 having a cylindrical skirt wall 10 suspended from a top face wall 8 and the circumferential edge of the top face wall, an inner circumferential surface of the skirt wall being formed with a female thread with which a male thread is threadedly engaged, and a cylindrical tamper-evident hem part 6 connected with the skirt wall of the body via a plurality of breakable bridging portions 22. Stopping means for being stopped by the stopper jaw portion is arranged in the inner circumferential surface of the cylindrical tamper-evident hem part. A downwardly protruding piece 40 is arranged in the skirt wall of the body. Non-breaking connecting pieces 48a and 48b are arranged circumferentially on both sides of the protruding piece. At least one slit extending upwardly from the lower edge of the protruding piece is formed in the protruding piece.