A kind of pressure sore preventing air bed structure-improved, the plural inflatable column of interconnection is respectively equipped with including its leading portion portion of ontology what, middle portion and Hou section portion, wherein, the plural number inflatable column system in leading portion portion is in contour diameter, is improved in what: its diameter of plural number inflatable column that the plural number inflatable column of its contour diameter in leading portion portion of ontology is connected with its middle portion of ontology and Hou section portion is respectively by big and small and in the stairstepping low by height. Thereby structure can make shank and foot Hou hang down with putting the presentation of what ontology in natural relaxation state. 一種防褥瘡氣墊床改良結構，包括本體於其前段部、中段部及後段部分別設有相互連接之複數充氣柱，其中，前段部之複數充氣柱係呈等高直徑，其改良在於：本體其前段部等高直徑之複數充氣柱與本體其中段部及後段部相連接之複數充氣柱其直徑分別為由大而小並呈由高而低之階梯形狀。藉此結構，能使小腿及腳後跟置放於本體呈現垂下呈自然放鬆狀態。
