PROBLEM TO BE SOLVED: To provide a method of manufacturing a stent delivery system capable of preventing breakage of a flexible self expansion type stent and a stent delivery system (especially, an inner shaft) at crimping.SOLUTION: A method of manufacturing a stent delivery system which comprises an outer shaft, a stent 201 arranged coaxially in the outer shaft, an inner shaft arranged coaxially in the stent, and a projection part 106 formed on a part of the inner shaft, includes the steps of: (1) reducing a diameter of the stent on the projection on the inner shaft (2) making a distal end 502 of a quill 501 contact to a distal end of the inner shaft or the distal end of the stent and (3) pressing the quill in axial direction to simultaneously insert the stent and the inner shaft into the outer shaft. In the method, a quill having a hollow structure portion extending from a distal end to a proximal side in axial direction is used as the quill.
