A disposable diaper (10) comprising: an absorbent body (40) having an absorbent core a pair of fastening tapes (90) a waist expansion/contraction sheet having expansion/contraction properties in the product width direction and a waist holding section that holds the disposable diaper on to the body of a wearer. The waist expansion/contraction sheet has: a rear-side waist expansion/contraction sheet (85) arranged in the rear waist area and a front-side waist expansion/contraction sheet (86) arranged in the front-side end section in the front waist area. Some of the rear-side waist expansion/contraction sheet is arranged overlapping the rear-side end section of the absorbent core and is arranged overlapping the waist holding section. The front-side waist expansion/contraction sheet is arranged adjacent to the front-side end section of the absorbent core.用後即棄型紙尿褲(10),具備有:具有吸收性芯片的吸收體(40)、及一對黏扣帶(90)、及於產品寬度方向具有伸縮性之腰圍伸縮薄片、以及將用後即棄型紙尿褲保持於穿著者的身體之腰圍保持部。腰圍伸縮薄片,具備有:配置於上述後腰圍域之後側腰圍伸縮薄片(85)、以及配置於前腰圍域的前側端部之前側腰圍伸縮薄片(86)。後側腰圍伸縮薄片的一部分,是與吸收性芯片的後側端部重疊地配置,且與腰圍保持部重疊地配置。前側腰圍伸縮薄片,為鄰接於吸收性芯片的前側端部而配置。10R‧‧‧後側端部40‧‧‧吸收體85‧‧‧後側腰圍伸縮薄片85F‧‧‧前側端部85R‧‧‧後側端部90‧‧‧黏扣帶
