Provided is a stent delivery device capable of rapidly transporting a stent to an indwelling site. A stent delivery device includes: a catheter which includes an inner sheath and an outer sheath allowing the inner sheath to be slidably inserted therethrough； a stent which is provided between the inner sheath and the outer sheath in the vicinity of a distal end of the catheter； and a guiding elongated body which is inserted through an inner lumen of the inner sheath and is partially exposed from the distal end of the catheter so as to guide the insertion of the catheter, in which the guiding elongated body has a variable tip area provided in the vicinity of a distal end of the guiding elongated body so as to change flexibility between a first state in which the variable tip area has predetermined flexibility and a second state in which the variable tip area is hardly bent as compared with the first state.
