OUTER CYLINDER FOR PREFILLED SYRINGE, PIERCING TOOL FOR PREFILLED SYRINGE, PREFILLED SYRINGE, AND PACKAGING BODY FOR PACKAGING OUTER CYLINDER FOR PREFILLED SYRINGE
An outer cylinder for a prefilled syringe has an outer cylinder body with a distal part having an opening and an outer cylinder closure member which seals the opening, accommodates a sealing member through which a needle portion of a hollow needle is penetrable, and is mounted on the distal part of the outer cylinder body. The outer cylinder closure member has a piercing member mounting portion on which the piercing member is mountable and a regulation portion which regulates separation and rotation of the outer cylinder closure member. The outer cylinder closure member further includes a portion which engages the piercing member side engaging portion when the outer cylinder is pressed into the piercing member and which regulates the separation of the piercing member from the outer cylinder closure member, after the outer cylinder closure member side engaging portion engages the piercing member side engaging portion.
