Abstract: A ladder and carrier assembly for attachment beneath the deck of a boat, such as a pontoon boat or party boat, includes a carrier suspended horizontally below the boat deck and provided with a rearmost transverse end element. A ladder support assembly mounted adjacent the forwardmost end of the carrier is provided with a pair of transverse rods disposed in vertical planes laterally offset from one another and which define a ladder clearance therebetween. A ladder having two longitudinal siderails includes a plurality of transverse steps and is disposed within the clearance of the support assembly. Restriction in displacement of the ladder from a substantially horizontal stowed position, to that of an extended inclined position, is controlled by a pair of stop members depending from the inner faces of the ladder siderails, adjacent their rear ends, and which alternately abut the carrier end element and one of the support assembly rods.