there is provided a container closure that can easily be manufactured , has improved drop strength and is convenient for opening operation . the present invention provides a container closure comprises , a substrate having adequate property for retaining an object which is enclosed in a container , a peripheral section formed on the periphery area of the container closure on the opposite side of a side where the substrate is attached to a container body , a panel section covering an area of the substrate surrounding by the peripheral section on the same side where the peripheral section is provided , and a score section formed between the peripheral portion and the panel section to provide a weakened region , the peripheral section and the panel section is a plastic layer formed with the same heat - fusible plastic on the substrate . substantial area of the score section is constructed of the substrate . further , the thin layer is formed on at least a part of the substrate of the score section with the heat - fusible plastic that connects the peripheral section and the panel section .