An easily openable container lid for a container having a cylindrical mouth-neck section having an annular locking ridge formed in an upper end part of an outer peripheral surface thereof, comprising: a shell including a circular top panel wall, a skirt wall extending from a peripheral edge of the top panel wall arcuately in a radially outward and downward direction and then extending downwardly vertically, in a vertical sectional view, and a gripping piece extending out from a lower end of the skirt wall, wherein the top panel wall, the skirt wall, and at least a base of the gripping piece are integrally formed from a metallic sheet, and the shell is formed with a pair of scores (20a, 20b) having first portions (20a-1, 20b-1) extending upwardly on the skirt wall from both sides of the gripping piece, and second portions (20a-2, 20b-2) continuous with the first portions (20a-1, 20b-1) and extending arcuately at an upper end of the skirt wall or the peripheral edge of the top panel wall; and a disk-shaped synthetic resin liner formed by embossing a synthetic resin material on an inner surface of the top panel wall of the shell, characterised in that the liner is adhered over an entire surface thereof to the inner surface of the top panel wall, at least the second portions (20a-2, 20b-2) of the pair of scores (20a, 20b) are formed by forming grooves on an inner surface side of the shell, and are extended along a peripheral edge of the liner radially outwardly of the liner, and the liner has a thin-walled central section and a thick-walled peripheral edge section, and has a downwardly protruding outer ridge formed in a radially outward region of the thick-walled peripheral edge section, the thin-walled central section of the liner has a thickness of 0.15 to 0.30 mm, and the thick-walled peripheral edge section has a thickness of 0.45 to 0.75 mm, wherein a downwardly protruding inner ridge is formed in a radially inward region of the thick-walled peripheral edge section of the liner. a shell including a circular top panel wall, a skirt wall extending from a peripheral edge of the top panel wall arcuately in a radially outward and downward direction and then extending downwardly vertically, in a vertical sectional view, and a gripping piece extending out from a lower end of the skirt wall, a circular top panel wall, a skirt wall extending from a peripheral edge of the top panel wall arcuately in a radially outward and downward direction and then extending downwardly vertically, in a vertical sectional view, and a gripping piece extending out from a lower end of the skirt wall, wherein the top panel wall, the skirt wall, and at least a base of the gripping piece are integrally formed from a metallic sheet, and the shell is formed with a pair of scores (20a, 20b) having first portions (20a-1, 20b-1) extending upwardly on the skirt wall from both sides of the gripping piece, and second portions (20a-2, 20b-2) continuous with the first portions (20a-1, 20b-1) and extending arcuately at an upper end of the skirt wall or the peripheral edge of the top panel wall; and a disk-shaped synthetic resin liner formed by embossing a synthetic resin material on an inner surface of the top panel wall of the shell, characterised in that the liner is adhered over an entire surface thereof to the inner surface of the top panel wall, at least the second portions (20a-2, 20b-2) of the pair of scores (20a, 20b) are formed by forming grooves on an inner surface side of the shell, and are extended along a peripheral edge of the liner radially outwardly of the liner, and