An intraocular lens injection instrument for injecting an intraocular lens (1a, 1b) including an optical part and support parts into an eye by folding the IOL, comprising: a cylinder body part provided, at its front end, with an injection part configured to internally hold the IOL and inject the IOL into the eye through an incision formed in the eye; and a plunger for pushing the IOL out of the injection part, the plunger including a push rod formed with a tip end and being placed in the cylinder body part to be movable in an axial direction of the cylinder body part, characterized by ' a tip end portion of the push rod including a holding part for catching and holding the support parts of the IOL between a side wall of the tip end portion and an inner wall of the injection part, the holding part being formed to provide an opening made by cutting out a part of the push rod of the plunger in a direction along an axis from a tip end toward a base end of the plunger to allow a rear support part of the IOL to get into between the inner wall of the injection part and the side wall of the tip end portion of the push rod for holding a part of the rear support part to uniformly determine an opening direction of the folded optical part irrespective of the folded state of the optical part in the injection part, and the holding part including a plane formed in a position on axis and apart from the tip end toward the base end of the plunger by a predetermined distance to push out the rear support part through the front end of the injection part; and wherein the intraocular lens injection instrument includes a bevel formed in the front end of the injection part, wherein the bevel has a predetermined slant angle with respect to the plunger axis, wherein the bevel is formed in the slant direction according to the opening direction of the IOL, and wherein the bevel is determined by its slant direction to face one surface of the optical part while the IOL is opened outside an injection tube. a cylinder body part provided, at its front end, with an injection part configured to internally hold the IOL and inject the IOL into the eye through an incision formed in the eye; and a plunger for pushing the IOL out of the injection part, the plunger including a push rod formed with a tip end and being placed in the cylinder body part to be movable in an axial direction of the cylinder body part, characterized by ' a tip end portion of the push rod including a holding part for catching and holding the support parts of the IOL between a side wall of the tip end portion and an inner wall of the injection part, the holding part being formed to provide an opening made by cutting out a part of the push rod of the plunger in a direction along an axis from a tip end toward a base end of the plunger to allow a rear support part of the IOL to get into between the inner wall of the injection part and the side wall of the tip end portion of the push rod for holding a part of the rear support part to uniformly determine an opening direction of the folded optical part irrespective of the folded state of the optical part in the injection part, and the holding part including a plane formed in a position on axis and apart from the tip end toward the base end of the plunger by a predetermined distance to push out the rear support part through the front end of the injection part; and wherein the intraocular lens injection instrument includes a bevel formed in the front end of the injection part, wherein the bevel has a predetermined slant angle with respect to the plunger axis, wherein the bevel is formed in the slant direction according to the opening direction of the IOL, and wherein the bevel is determined by its slant direction to face one surface of the optical part while the IOL is opened outside an injection tube.