Abstract: A ladder leg extender apparatus for attachment to the leg of a ladder to lengthen the leg as required to support the ladder on an uneven support surface. The apparatus comprises a sleeve secured to a shortened leg of the ladder which slidably carries an extendible support leg therein for movement inwardly and outwardly of the sleeve to adjust the length of the leg. Infinitely variable vertical adjustment of the support leg is achieved by (1) loosening two turn bolts which secure the support leg between the bolts on one side and a coarse file on the other side thereof within the sleeve and then (2) tightening the bolts when the support leg is properly slidably adjusted with the associated ladder is in an upright and level orientation.