Provided is an intraocular lens insertion instrument that reduces the stress on ocular tissues and enables stable insertion of an intraocular lens. This intraocular lens insertion instrument has: a substantially-cylindrical insertion member which is to be inserted inside an eye； an opening which is provided to the leading end of the insertion member and through which an intraocular lens is injected into the eye； and an intraocular lens pressing member which pushes the intraocular lens so as to be moved within the insertion member and which injects the intraocular lens into the eye through the opening, wherein the opening direction of the opening is slanted with respect to the extension direction of the insertion member, a recess of a prescribed depth extending in the extension direction is provided to an outer peripheral surface of the insertion member at the insertion member rear end side of the opening, and when the insertion member is inserted in the eye and when the intraocular lens is moved within the insertion member, the recess undergoes elastic deformation causing the opening to expand or contract.
