A disposable diaper has a chassis and a body fluid absorbent structure. The body fluid absorbent structure comprises a panel of body fluid absorbent material and a liquid-pervious sheet covering a surface of the panel facing the wearer's skin. The diaper is provided with a plurality of crossover members extending across the body fluid absorbent structure and facing the liquid-pervious sheet. The crossover member has its transversely opposite end portions bonded to the diaper in the vicinity of the side edge portions of the body fluid absorbent structure and its intermediate portion defined between the side end portions not bonded to the liquid-pervious sheet.