Abstract: An absorbent article such as disposable diaper or sanitary napkin in which discharged liquid can be penetrated and diffused quickly. A rectangular shaped flat absorbent core interposed between a front surface sheet and a back surface sheet comprises at least one ditch traversing a point within a circle with a radius of 25 mm from its plane center to the periphery of the flat absorbent core so as to divide the flat absorbent core into not less than two parts.

Abstract: In disposable diaper, an absorbent product is composed of fluffed pulp, synthetic fibers, a super absorbent material, and the like, and includes elastic means disposed adjacent to both sides of the absorbent core so as to longitudinally traverse the absorbent core extending from the back to the stomach through the crotch when the disposable diaper is applied to the human body. Thus, when urine, feces, body fluids, and the like are discharged, even if the weight of the absorbent core is increased by absorbing the substances, the leakage of the substances can be prevented because the shape retention property of the disposable diaper can be maintained by the tension of the elastic materials longitudinally traversing the absorbent core.