To provide a method for manufacturing a stent delivery system capable of preventing a stent from coming off or moving when a balloon catheter with the stent attached thereto is inserted up to a stricture part by pre-processing the stent without causing the influence on the performance of an existing balloon catheter.

The method for manufacturing the stent delivery system includes the steps of: previously shrinking a prepared stent into a second diameter having an inner diameter the same as or smaller than the outside diameter of a folded balloon, inserting the folded balloon into the same, and applying a pressure toward the diameter direction inside from the outer surface of the stent to shrink the stent into a third diameter after the completion of crimping.