Laminated gasket free from liquid drug leakage. Gasket (13) to be used for a medical syringe includes main body (14) made of an elastic material and film (15) on a surface of main body (14). Gasket (13) has a circumferential surface portion (17) that can contact an inner peripheral surface of syringe barrel (11) of the syringe, and has an annular groove (22) formed circumferentially in a surface portion of the film present in the circumferential surface portion thereof. Annular groove (22) has outer edge portions (24) provided along opposite edges (23) thereof as projecting from an unprocessed surface portion of the film. Annular groove (22) has groove formation start points and end points that are connected to each other in a groove connection region. Outer edge portions (24) along the opposite edges of the annular groove have a maximum-to-minimum height difference of ≤5 μm in the groove connection region.
