A device for inserting a stent of the present invention comprises: a first stent insertion unit and a second stent insertion unit. The first stent insertion unit comprises: a first insertion portion formed by extending a first outer tube a first aiding portion formed by extending a first inner tube inserted into the first insertion portion to be slid back and forth inside the first outer tube a first central tube into which a first guide wire is to be inserted, and which is inserted into the first aiding portion to penetrate the first inner tube and a first stent to be inserted into the front end of the first outer tube while encompassing the circumference of the first central tube and is discharged outside the first outer tube by forward movement of the first inner tube so as to be extended. The second stent insertion unit comprises: a second insertion portion formed by extending a second outer tube to be inserted into the first outer tube a second aiding portion formed by extending a second inner tube inserted into the second insertion portion to slide back and forth inside the second outer tube a second central tube which is inserted into the first insertion portion to be extended between the first outer tube and the first inner tube, into which a second guide wire fixed to the first stent is inserted, and which is inserted into the second aiding portion to penetrate the second inner tube and a second stent to be inserted into the front end of the second outer tube while encompassing the circumference of the second central tube and is discharged outside the second outer tube by forward movement of the second inner tube so as to be extended. In addition, a method for inserting a stent of the present invention comprises the steps of: inserting the first guide wire into a main stenosis region inserting the first guide wire into the first central tube to insert the first outer tube into the main stenosis region along the first guide wire operating the first stent ins
