A syringe and a syringe set are provided. The syringe can be readily distinguished from other syringes only by viewing a tip of the syringe. The syringe includes a tip 15 provided at an end of a barrel body 11 to be filled with a medicine and having an outer diameter of 4.315 mm to 6 mm, a peripheral wall 18 provided around the tip 15 concentrically with the tip 15, and a helical rib 19 formed on an inner face of the peripheral wall 18 or an outer face of the tip 15.