An intraocular lens injector comprising: a lens holder holding an intraocular lens which has a optic and a haptic (7b, 7c) extending in a curved shape from the optic; a device body to which the lens holder is attached; a plunger inserted projectably/retractably in the device body and coming into contact with the intraocular lens to push out this intraocular lens; a nozzle portion connected to the device body, the nozzle portion releasing the intraocular lens while folding the intraocular lens concavely by a push-in operation of the plunger; and a positioning mechanism pushing up the haptic along a thickness direction of the optic within a range contactable with a distal end of the plunger when the lens holder and the intraocular lens are attached to the device body, characterized in that the positioning mechanism is provided in distribution in the device body and in the lens holder, wherein the positioning mechanism includes: - a convex portion (24; 24a, 24b) provided by the device body, the convex portion (24; 24a, 24b) protruding from a bottom portion of the device body and having an end face pushing up the haptic at the time of attachment of the lens holder and the intraocular lens to the device body, and - an inserting portion provided in the lens holder in that the convex portion (24; 24a, 24b) is inserted to avoid interference with the convex portion (24; 24a, 24b). a lens holder holding an intraocular lens which has a optic and a haptic (7b, 7c) extending in a curved shape from the optic; a device body to which the lens holder is attached; a plunger inserted projectably/retractably in the device body and coming into contact with the intraocular lens to push out this intraocular lens; a nozzle portion connected to the device body, the nozzle portion releasing the intraocular lens while folding the intraocular lens concavely by a push-in operation of the plunger; and a positioning mechanism pushing up the haptic along a thickness direction of the optic within a range contactable with a distal end of the plunger when the lens holder and the intraocular lens are attached to the device body, characterized in that the positioning mechanism is provided in distribution in the device body and in the lens holder, wherein the positioning mechanism includes: - a convex portion (24; 24a, 24b) provided by the device body, the convex portion (24; 24a, 24b) protruding from a bottom portion of the device body and having an end face pushing up the haptic at the time of attachment of the lens holder and the intraocular lens to the device body, and - an inserting portion provided in the lens holder in that the convex portion (24; 24a, 24b) is inserted to avoid interference with the convex portion (24; 24a, 24b). - a convex portion (24; 24a, 24b) provided by the device body, the convex portion (24; 24a, 24b) protruding from a bottom portion of the device body and having an end face pushing up the haptic at the time of attachment of the lens holder and the intraocular lens to the device body, and - an inserting portion provided in the lens holder in that the convex portion (24; 24a, 24b) is inserted to avoid interference with the convex portion (24; 24a, 24b).