An intraocular lens insertion device includes: a plunger that extrudes a deformable intraocular lens into an eye along an extrusion axis, the deformable intraocular lens including an optical part and one or a plurality of support parts extending outward from a periphery of the optical part; an installation part in which the intraocular lens is installed in a state where at least one support part is placed closer to a proximal end side of the extrusion axis than the optical part; and an off-axis movement part that presses the support part of the intraocular lens installed in the installation part from a direction different from the extrusion axis to deform and move the support part.