An interior body (1) of a disposable diaper includes a liquid permeable front sheet (2) a liquid impermeable back sheet (3) and a liquid retaining absorbent core (4). The front sheet consists of a single sheet including spunbond layers on the front side and back side and a melt blown layer between the spunbond layers. The absorbent core consists of fiber aggregates and super absorbent polymer particles. The front sheet covers the skin side surface of the absorbent core while being directly bonded to the skin side surface. The length of the front sheet in the lengthwise direction is longer than the length of the absorbent core in the lengthwise direction so that the front sheet is provided with extended sections which extend outward in the lengthwise direction from both ends of the absorbent core in the lengthwise direction while the extended sections are each continuously connected in the transverse direction with the front sheet or back sheet which overlaps with the extended section. The extended sections can directly contact the skin of the wearer.
