To provide an easy-to-peel lid to be put over a cup container 30 made of an expanded polystyrene or the like for thermally fusion-bonding a periphery 22 of the lid 20, wherein a paper material layer 4 of the lid 20 without an aluminum foil laminated is resistant to an influence of steam generated from hot water and dead foldability is applied to an easy-to-peel layer 6 of the lid 20 by suppressing its properties to restore to an original shape.

The easy-to-peel lid 20 comprises the paper material layer 4, the resin film layer 5 and the easy-to-peel layer 6. One or more strings of linear of perforated cut lines 2, 2, 2, etc., and 3, 3, 3, etc., extending in a direction orthogonal to the direction of opening the lid are provided respectively on the easy-to-peel layer 6 and the paper material layer 4 except the periphery 22 of the lid 20 to be thermally fusion-bonded.