The object of the present invention is to provide a method of manufacturing a syringe barrel to ensure smoothness and productivity of a front tip of a nozzle.The method of manufacturing a syringe barrel according to the present invention is a method for manufacturing from the front tip of the nozzle using injection molding, which utilizes an ultrasonic cutting apparatus having a mechanism for suppressing abnormal vibrations, in order to cut off the gate burrs around the nozzle.本發明之目的是提供:可確保筒嘴(nozzle)前端的平滑性以及生產性之注射器針筒(syringe barrel)的製造方法。本發明之注射器針筒的製造方法,是用來製造從筒嘴前端進行射出成形的注射器針筒的方法,其是利用具備了可抑制異常振動的機構之超音波切斷裝置,來將筒嘴部的澆口毛刺(gate burr)予以切斷。1‧‧‧筒嘴部2‧‧‧肩部3‧‧‧圓筒部4‧‧‧圓筒部末端5‧‧‧凸緣100‧‧‧單層注射器針筒
