PROBLEM TO BE SOLVED: To provide a lid member that is mainly applied to a yoghurt packaging container, the lid member being capable of effectively preventing yoghurt of contents from adhering to the rear face of a lid while keeping favorable heat sealability and sealability.SOLUTION: On the outer face of a heat sealing layer 5 laminated on a base material layer 1, an adhering prevention layer 6 is formed by using hydrophobic wet silica particles which are wet silica particles, and subjected to hydrophobic treatment with silicone having viscosity of 100cst or more, particularly dimethyl polysiloxane, used as a treatment agent.
