Provided is a monofocal intraocular lens having a greater depth of field than conventional monofocal lenses and making it possible to reduce the number of situations where the subject would need eyeglasses. In the monofocal lens, the MTF characteristic at 50 lp/mm with respect to a light ray passing from the center of the lens part through a region having a radius of 1.5 mm is 20% or more within a range from the reference power to the reference power +1.5 diopters near, and, in the diopter dependency curve of MTF with the diopter as the abscissa, there is one maximal value and no minimal value in the region of MTF 20% or more in the range from the reference power to the reference power +1.5 diopter.為了提供一種單焦點人工水晶體，其具有以比以往的單焦點人工水晶體更深的景深，可降低接受手術者必須戴眼鏡的機會。在單焦點人工水晶體中，對於通過從透鏡部的中心到半徑1.5mm的區域之光線在50lp/mm的MTF特性，在從基準度數到該基準度數+1.5屈光度近處的範圍為20%以上，在以屈光度為橫軸之MTF的屈光度依存性曲線上，在從基準度數到上述基準度數+1.5屈光度的範圍之MTF20%以上的區域中，具有1個極大值且沒有極小值。
