A prefilled syringe includes a syringe barrel including: a liquid drug discharge portion on a distal end of the barrel, and an opening on a proximal end of the barrel； a cap； a gasket located in the syringe barrel； a plunger including: a shaft portion inserted in the syringe barrel from the opening, and a pressing portion located on a proximal end of the shaft portion and configured to be manually pushed by a user, the plunger being movable toward a distal direction by pushing the pressing portion to slide the gasket toward the liquid drug discharge portion； a liquid drug； an upraised portion located on an inner wall of the syringe barrel between the gasket and the opening； and a clicker.
