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 passage having a passage area gradually decreasing toward a tip end of the intraocular lens injection instrument ; inner wall surfaces formed on both sides in a direction orthogonal to an axial direction of the passage , the direction being parallel to a radial direction of the optical part when the intraocular lens is placed in the passage ; a ceiling surface and a bottom surface formed, respectively, on each of both sides in a direction orthogonal to the axial direction of the passage , the direction being parallel to an axial direction (L) of the optical part when the intraocular lens is placed in the passage , a push member configured to push out the intraocular lens , the push member including a contact portion to be placed in contact with the intraocular lens ; and a lens control mechanism to control an orientation of the intraocular lens in a circumferential direction of the optical part , characterized in that the intraocular lens injection instrument further comprises protrusions protruding from the ceiling surface toward the bottom surface and constituting wall surfaces of a guide portion provided on the ceiling surface to guide a push-out direction (Lp) of the push member , and the lens control mechanism is formed on an end side of the protrusion close to the tip end to protrude toward an inside of the guide portion , the lens control mechanism protrudes from the ceiling surface toward the bottom surface in the passage , the lens control mechanism being configured to direct movement of the contact portion of the push member toward one of the inner wall surfaces when or after the intraocular lens with the first support part positioned ahead of the optical part toward the tip end in the passage is pushed toward the tip end by the push member and then the first support part is folded so that a distal end portion of the first support part is disposed more inward than the outer circumferential part of the optical part . a passage having a passage area gradually decreasing toward a tip end of the intraocular lens injection instrument ; inner wall surfaces formed on both sides in a direction orthogonal to an axial direction of the passage , the direction being parallel to a radial direction of the optical part when the intraocular lens is placed in the passage ; a ceiling surface and a bottom surface formed, respectively, on each of both sides in a direction orthogonal to the axial direction of the passage , the direction being parallel to an axial direction (L) of the optical part when the intraocular lens is placed in the passage , a push member configured to push out the intraocular lens , the push member including a contact portion to be placed in contact with the intraocular lens ; and a lens control mechanism to control an orientation of the intraocular lens in a circumferential direction of the optical part , characterized in that <EOS>