The utility model provides a disposable diaper (1). The disposable diaper (1) comprises an absorption body (21), a liquid permeable front sheet (22), a leakage-proof sheet (23), an absorptive main body (2) and a pair of flap parts (3), wherein the leakage-proof sheet (23) is composed of resin thin films which are not permeable for liquid or hard to be permeable for the liquid, the absorptive main body (2) is provided with outer wrapped non-woven fabrics (24), and the flap parts (3) are provided with hasp belts (4) a front face cover sheet (31) is made to be a part to cover the front sheet (22) and fixed outside two side edges (21s, 21s) of the absorption body and an end portion (21b) of one side of a back side portion (B), the outer wrapped non-woven fabrics (24) extend to the exterior of the end edge of the back side of the leakage-proof sheet (23), the end edge of the back side of the leakage-proof sheet (23) ends at the interior of an interband area (R) or a position, closes to the crotch side, of the interband, the absorption body (21) ends at the position, closes to the crotch side, of the interband area (R), an elasticity sheet (7) ends at the interior of the interband area (R) or a position which is closer to the crotch side, and the elasticity sheet (7) adjoins the leakage-proof sheet (23) or is overlapped with the leakage-proof sheet (23) in one part.
