Abstract: A device for leveling a ladder on unlevel or uneven surfaces that includes a wedge shaped support member and features for safely retaining a ladder on a sloped top surface of the support member. Features include a rail, a slip resistant coating on the top surface, and a slip resistant tread on a bottom surface, the tread having a plurality of ribs. To prevent sliding on hard surfaces, the rubber grip tread preferably consists of a hard, substantially nonresilient rubber. To prevent sliding on soft surfaces, the device has a pair of retaining member bores and retaining members. Retaining member storage bores prevent the retaining members from being lost. A finger hold assists in removing the retaining members from a support surface. A ladder hanger bore assists in storing and transporting the device. Imprinted indicia prevent misuse of the device.