In the case of cutting the remainder of the nozzle part gate of the multi-layer syringe barrel, there is no burr peeling on the cut surface after cutting, no peeling of the multi-layer structure occurs in the nozzle part, and no sharp corners in the nozzle part that damage the cap Multi-layer syringe An object of the present invention is to provide a method for manufacturing a barrel. The said subject can be solved by the following manufacturing methods. A method for manufacturing a multi-layer syringe barrel, comprising: a finishing cutting step of cutting a nozzle portion gate residue of an injection-molded multi-layer syringe barrel from a nozzle tip with a cutting blade of an ultrasonic cutting device having a mechanism for suppressing abnormal vibration; and an irradiation step of irradiating laser light to each part of the nozzle unit formed in the finish cutting step.
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