An intraocular lens insertion device for use with an intraocular lens including an optic having an outer edge and a pair of support portions (7a, 7b) with proximal ends at the outer edge and tips, the intraocular lens insertion device comprising: a lens setting part including an inner wall defining passage configured to hold the intraocular lens with the optic folded, the support portion forward of the optic, the support portion backward of the optic, which is a trailing support portion, the proximal ends of the support portions (7a, 7b) located opposite the fold in the optic and the tips of the support portions (7a, 7b) hanging down on one side as they move in the forward and backward directions of a lens advancing axis across the optic, respectively; a nozzle; a plunger, including a pushing rod with a distal end, a lens contact portion at the distal end of the pushing rod, and a plunger pushing portion (33, 50) connected to the lens contact portion at the distal end of the pushing rod, movable in a forward direction to push the intraocular lens out of the lens setting part and through the nozzle; characterized in that: the top surface of the plunger pushing portion (33, 50) includes a groove (34, 51) extending in the backward direction from the lens contact portion and guides (35; 52) provided on both sides of the groove (34, 51) in parallel with the lens advancing axis; such that a forward movement of the plunger and the lens contact portion causes the trailing support portion, which is hanging down to one side, to be bent at its tip in the forward direction, to be guided into the groove (34, 51) and caught by the plunger pushing portion (33, 50), and, when the plunger is pushed further, the lens contact portion abuts against an outer edge of the optic and moves the intraocular lens forward. a lens setting part including an inner wall defining passage configured to hold the intraocular lens with the optic folded, the support portion forward of the optic, the support portion backward of the optic, which is a trailing support portion, the proximal ends of the support portions (7a, 7b) located opposite the fold in the optic and the tips of the support portions (7a, 7b) hanging down on one side as they move in the forward and backward directions of a lens advancing axis across the optic, respectively; a nozzle; a plunger, including a pushing rod with a distal end, a lens contact portion at the distal end of the pushing rod, and a plunger pushing portion (33, 50) connected to the lens contact portion at the distal end of the pushing rod, movable in a forward direction to push the intraocular lens out of the lens setting part and through the nozzle; characterized in that: the top surface of the plunger pushing portion (33, 50) includes a groove (34, 51) extending in the backward direction from the lens contact portion and guides (35; 52) provided on both sides of the groove (34, 51) in parallel with the lens advancing axis; such that a forward movement of the plunger and the lens contact portion causes the trailing support portion, which is hanging down to one side, to be bent at its tip in the forward direction, to be guided into the groove (34, 51) and caught by the plunger pushing portion (33, 50), and, when the plunger is pushed further, the lens contact portion abuts against an outer edge of the optic and moves the intraocular lens forward.