The present invention relates to a disposable diaper for absorbing and receiving excreted urine and feces, and provides a disposable diaper divided into a front surface part touching the wearer's abdomen, a rear surface part touching the wearer's back, and a gap part in which the front surface part and the rear surface part extend in the lengthwise direction so as to pass between the wearer's legs, the disposable diaper including: a base layer including an absorber at an upper end thereof in the lengthwise direction on the basis of the center of the gap part, and including first elastic members on both sides in the lengthwise direction so as to encompass the wearer's legs； a cover layer positioned at an upper end of the absorber so as to cover the absorber； and a skin contact layer positioned at an upper end of the base layer so as to cover the cover layer, having an inlet cutting part cut in a predetermined length such that urine and feces easily reach the cover layer or the absorber, and having second elastic members, which come into close contact with the bottom layer skin of the wearer's buttocks in the lengthwise direction on both sides and are spaced apart from the inlet cutting part at predetermined intervals.
