An intraocular lens insertion instrument capable of smoothly pushing out a preset lens is provided. An intraocular lens insertion instrument comprises: a main body including a lens setting section on which a lens is set, a transition section that deforms the lens, and a nozzle piece that releases the lens; and a lens push-out mechanism that pushes out the lens set on the lens setting section. The instrument further includes a releasing means for releasing the lens pushed by the lens push-out mechanism from the lens setting section. The releasing means has a posture holding mount that holds the lens with a forward tilt relative to an axial line of lens movement. The posture holding mount has a passage through which the lens push-out mechanism passes.