An intraocular lens insertion instrument (10) comprising: an instrument body (12) which is generally tubular in shape to accommodate an intraocular lens (14), and which includes an insertion tube section (76) arranged in a distal end section of the instrument body (12) in an axial direction； and a plunger element (16), adapted to be inserted into the body (12) of the instrument from a rear in the axial direction, and adapted to move forward to insert the intraocular lens (14) into one eye, so that the lens (14) intraocular undergoes a compact deformation in association with a forward movement in the axial direction by the piston element (16), and is adapted so that it can be pushed outwardly through the section (76) of insertion tube, the insertion tube section (76) has an inclined hole (94) at a distal end thereof, opening diagonally with respect to a central axis of the insertion tube section (76), the element (16) of The piston is equipped with a sliding part (106) that slides against the instrument body during its movement in a sinking direction in the instrument body (12), characterized in that a graduation mechanism (35, 108) is provided of resistance to gradually increase the operating resistance of the plunger element (16), gradually increasing the contact force exerted on the sliding part (106) when the intraocular lens (14) gradually emerges from the hole (94) inclined by the collapse of the element (16) ) of piston in the body (12) of instrument.Un instrumento (10) de inserción de lente intraocular que comprende:un cuerpo (12) de instrumento que tiene en general forma tubular para dar cabida a una lente (14) intraocular, yque incluye una sección (76) de tubo de inserción dispuesta en una sección de extremo distal del cuerpo (12) deinstrumento en una dirección axial； y un elemento (16) de émbolo, adaptado para insertarse en el cuerpo (12) deinstrumento desde una parte trasera en la dirección axial, y adaptado para moverse hacia delante para insertar lalent
