An intraocular lens insertion tool (10, 200) including a tool body in a form of a cylinder adapted to contain an intraocular lens, a plunging member to be assembled to the tool body by being inserted therein in an axial direction from a back, a stage on which the intraocular lens is adapted to be placed provided at a middle of the tool body in the axial direction, and an insertion cylinder of tapered shape on a tip side of the stage in the axial direction, the plunging member being adapted to be plunged in order to move forward the intraocular lens placed on the stage in the axial direction so that the intraocular lens is deformed compactly and pushed out through the insertion cylinder into an eye: the insertion cylinder includes a bottom surface continuous from a lens platform of the stage, and an upper surface placed opposite the bottom surface; a central protrusion is provided at a central portion in a width direction of the tool body in the bottom surface of an introductory part on a side of the stage of the insertion cylinder so as to extend in the axial direction of the tool body and be made to protrude toward the upper surface a pair of lateral protrusions are provided at both ends in the width direction of the tool body in the upper surface of the introductory part so as to extend in the axial direction of the tool body and be made to protrude toward the bottom surface the intraocular lens insertion tool being characterized in that: the plunging member has a lens pressing surface formed at a tip face thereof in the axial direction with a dimension spanning from the bottom surface to the upper surface at a tip end section of the insertion cylinder; and the central protrusion and the pair of lateral protrusions are terminated at a position slightly beyond the introductory part, the central protrusion is made to get in contact with a center portion of a rear surface of an optical zone of the intraocular lens when sent into the insertion cylinder, the pair of lateral protrusions are to get in contact with both ends of a front surface of the optical zone of the intraocular lens when sent into the insertion cylinder, so that the optical zone of the intraocular lens is subject to initial deformation in a mountain shape wherein the front surface of the optical zone is made convex at the introductory part. the insertion cylinder includes a bottom surface continuous from a lens platform of the stage, and an upper surface placed opposite the bottom surface; a central protrusion is provided at a central portion in a width direction of the tool body in the bottom surface of an introductory part on a side of the stage of the insertion cylinder so as to extend in the axial direction of the tool body and be made to protrude toward the upper surface a pair of lateral protrusions are provided at both ends in the width direction of the tool body in the upper surface of the introductory part so as to extend in the axial direction of the tool body and be made to protrude toward the bottom surface the intraocular lens insertion tool being characterized in that: the plunging member has a lens pressing surface formed at a tip face thereof in the axial direction with a dimension spanning from the bottom surface to the upper surface at a tip end section of the insertion cylinder; and the central protrusion and the pair of lateral protrusions are terminated at a position slightly beyond the introductory part, the central protrusion is made to get in contact with a center portion of a rear surface of an optical zone of the intraocular lens when sent into the insertion cylinder, the pair of lateral protrusions are to get in contact with both ends of a front surface of the optical zone of the intraocular lens when sent into the insertion cylinder, so that the optical zone of the intraocular lens is subject to initial deformation in a mountain shape wherein the front surface of the optical zone is made convex at the introductory part. the plunging member has a lens pressing surface formed at a tip face thereof in the axial direction with a dimension spanning from the bottom surface to the upper surface at a tip end section of the insertion cylinder; and the central protrusion and the pair of lateral protrusions are terminated at a position slightly beyond the introductory part, the central protrusion is made to get in contact with a center portion of a rear surface of an optical zone of the intraocular lens when sent into the insertion cylinder, the pair of lateral protrusions are to get in contact with both ends of a front surface of the optical zone of the intraocular lens when sent into the insertion cylinder, so that the optical zone of the intraocular lens is subject to initial deformation in a mountain shape wherein the front surface of the optical zone is made convex at the introductory part.