A bedsore-free diaper folded portions for preventing lateral leak of human waste out of the diaper, a water absorbent cushion mat including a plurality of pneumatically distended portions provided independently of each other inside the diaper in such a manner that the distended portions face a side in contact with human body so as to correspond wth the lumosacral region of the human body inside the diaper and a guide mark provided inside the diaper on substantially a center line in the longitudinal direction of the direction at a specified interval from the cushion mat to provide an indication mark by which the user can precisely apply the cushion mat to the lumbosacral region.