An intraocular lens (IOL) injection instrument (10) includes: an injection part (20) having an inner wall to fold an IOL (1) into a smaller shape； and a cylinder body (30) including a plunger (40) to push out the IOL from a front end (21a) of the injection part. The instrument further includes: holding means (100) provided in the cylinder body to hold the IOL without applying stress thereto； and push means (120) for pushing the IOL by applying pressing force to the IOL to release holding of the IOL held by the holding means, and the holding means includes restriction means (112b) configured to restrict movement of the IOL while no pressing force is applied by the push means (120) and configured to be deformed in a moving direction of the IOL when the pressing force is applied by the push means to release restriction of the movement of the IOL.
