Gasket for Pre-Filled Syringe and Pre-Filled Syringe

摘要

The present invention relates to a gasket (7) for a pre-filled syringe 1 into which liquid (3) is charged, wherein a peripheral side surface of the gasket (7 a) that is in contact with an inner surface of the syringe barrel (2) is provided with a restriction (8), the bottom surface (7c) of the gasket (7) that is not in contact with the liquid (3) is formed into a tapered shape (10) and the gasket (7) has a hardness comprised from 57 to 60 when measured by a JIS hardness meter.