An intraocular lens injection instrument for injecting an intraocular lens into an eye, the intraocular lens comprising an optical part of a disk-like shape and a first support part extending outwardly from an outer circumferential part of the optical part, wherein the intraocular lens injection instrument comprises: a front-side passage having a passage area gradually decreasing toward a tip end side; a rear-side passage formed on a rear side of the front-side passage in a push-out direction (Lp) of the intraocular lens; a first inner wall surface and a second inner wall surface formed on both sides in a direction orthogonal to an axial direction of the rear-side passage, the direction being parallel to a radial direction of the optical part when the intraocular lens is placed in the rear-side passage; and a push member configured to push out the intraocular lens, the intraocular lens with the first support part positioned ahead of the optical part toward the tip end in the rear-side passage is pushed toward the front-side passage by the push member and then the intraocular lens is pushed toward the tip end by the push member in the front-side passage so that the first support part is folded inside the optical part during injection of the intraocular lens into the eye, the first inner wall surface is provided on a side where a root portion of the first support part is placed in the rear-side passage with respect to a central axis (Lt) of the rear-side passage when the intraocular lens is placed therein, characterized in that a first contact portion is provided closer to the central axis (Lt) of the rear-side passage than the first inner wall surface, and the first contact portion is formed to be in contact with the outer circumferential part of the optical part when the intraocular lens is pushed out. wherein the intraocular lens injection instrument comprises: a front-side passage having a passage area gradually decreasing toward a tip end side; a rear-side passage formed on a rear side of the front-side passage in a push-out direction (Lp) of the intraocular lens; a first inner wall surface and a second inner wall surface formed on both sides in a direction orthogonal to an axial direction of the rear-side passage, the direction being parallel to a radial direction of the optical part when the intraocular lens is placed in the rear-side passage; and a push member configured to push out the intraocular lens, a front-side passage having a passage area gradually decreasing toward a tip end side; a rear-side passage formed on a rear side of the front-side passage in a push-out direction (Lp) of the intraocular lens; a first inner wall surface and a second inner wall surface formed on both sides in a direction orthogonal to an axial direction of the rear-side passage, the direction being parallel to a radial direction of the optical part when the intraocular lens is placed in the rear-side passage; and a push member configured to push out the intraocular lens, the intraocular lens with the first support part positioned ahead of the optical part toward the tip end in the rear-side passage is pushed toward the front-side passage by the push member and then the intraocular lens is pushed toward the tip end by the push member in the front-side passage so that the first support part is folded inside the optical part during injection of the intraocular lens into the eye, the first inner wall surface is provided on a side where a root portion of the first support part is placed in the rear-side passage with respect to a central axis (Lt) of the rear-side passage when the intraocular lens is placed therein, characterized in that a first contact portion is provided closer to the central axis (Lt) of the rear-side passage than the first inner wall surface, and the first contact portion is formed to be in contact with the outer circumferential part of the optical part when the intraocular lens is pushed out.