Abstract: A combination container/syringe (1) provided with an outer cylinder (10) that forms a cylindrical shape centered on an axial line (O); a front stopper that is inserted into a distal end side of the outer cylinder (10); and a cylindrical tip (50) that is fitted to an outer periphery of the distal end of the outer cylinder via a fitting hole (61) at a base end side, and that has a bypass chamber (71) that houses the front stopper at a front side of the fitting hole, in which an inner diameter of the bypass chamber is formed larger than an outer diameter of the front stopper, and a plurality of ribs (74) that protrude toward an inside in a radial direction and extend in the direction of the axial line to make close contact with the outer peripheral surface of the front stopper that has moved to the inside of the bypass chamber are provided spaced apart in a circumferential direction on the inner peripheral surface (73) of the bypass chamber.

Abstract: A dual chamber prefillable syringe (100) includes: a cylinder (10) which has a bypass portion (11); a hub luer-lock (20); a front stopper (30); a middle stopper (40) which seals a preparation (S) together with the front stopper (30); an end stopper (50) which seals a solvent (L) together with the middle stopper (40); a finger grip (60); and a plunger rod (70) which is connected to the end stopper from the rear end side. A female screw portion (64) which is screwed around the axis line is formed on an inner circumferential surface of the finger grip (60), and a male screw portion (73) which is able to be screwed to the female screw portion is formed on an outer circumferential surface of the plunger rod (70).