To easily unseal a recessed lid material from a ring-like flange outer plate welded to a cup-like container due to the biting of the end of flange portion of the recessed lid material into the ring-like flange outer plate.

This recessed lid material A for a cup-like container comprises a side face portion 1, a bottom face portion 2 and an inclined flange portion 3, each being in the form of a film. In this lid material A, on an outer circumferential face extending from the upper end of the side face portion 1 to the flange portion 3 is provided a ring-like flange outer plate 4 made of a plastic, which is molded and joined to the above-mentioned outer circumferential face in an easily releasable manner. The top end face of the inclined flange portion 3 molded and joined to the ring-like flange outer plate 4 is cut in an oblique direction at a sharp angle relative to the surface of the flange portion 3, which is not in contact with the flange outer plate 4, and shows a substantially perpendicular end face.