A syringe includes a syringe barrel including: a liquid drug discharge portion on a distal end of the barrel, an opening on a proximal end of the barrel, and a body portion for storing a liquid drug； a gasket located in the syringe barrel； and a plunger including: a shaft inserted in the syringe barrel from the opening, and a pressing portion located on a proximal end of the shaft, the pressing portion being pushable by a thumb to slide the gasket toward the liquid drug discharge portion. The syringe barrel further includes a brim-shaped finger hooking portion, and a sleeve-shaped gripping portion.
