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).
