An unfolding-type disposable diaper (1) for an infant having a body weight of 3000 g or less, having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, and being provided with a front waist-surrounding area (1a), a crotch area (1b), and a rear waist-surrounding area (1c), the unfolding-type disposable diaper (1) having an absorbent body (4), a pair of fastening members (10) extending outward in the width direction from the rear waist-surrounding area (1c), leg-surrounding stretchable members (6) provided along a pair of leg-surrounding openings (HL) formed by fastening of the pair of fastening members (10) to the front waist-surrounding area (1a) and provided further outside in the width direction than the absorbent body (4), and a target display part (15) for indicating the position at which to fasten the pair of fastening members (10) to the front waist-surrounding area (1a), the absorbent body (4) being provided with an overlap region (A) in the longitudinal direction which overlaps with the target display part (15) in the thickness direction, and the length (L1) of the target display part (15) in the width direction being equal to or less than the maximum length (L2) of the absorbent body (4) in the width direction in the overlap region (A).一種用後即棄型紙尿褲,係具備有:相互正交之長邊方向、寬幅方向、以及厚度方向,並具備:前腰圍域、臀下域、以及後腰圍域,給體重3000g以下的嬰兒使用之展開型的用後即棄型紙尿褲,其特徵為,具備有:吸收體、及朝寬幅方向的外側並從後腰圍域延伸而出之一對固定黏著構件、及沿著藉由一對固定黏著構件固定黏著於前腰圍域而形成之一對腿圍開口設置且設置於比吸收體更靠寬幅方向的外側之腿圍伸縮性構件、以及顯示須將一對固定黏著構件固定黏著於前腰圍域的所須黏著位置之被黏扣標的顯示部;吸收體,於長邊方向上,具備有與被黏扣標的顯示部重疊於厚度方向的重疊區域,被黏扣標的顯示部的寬幅方向的長度,為位於重疊區域中之吸收體的寬幅方向的最大長度以下。1‧‧‧用後即棄型紙尿褲1a‧‧‧前腰圍域1b‧‧‧臀下域1c‧‧‧後腰圍域4‧‧‧吸收體4a‧‧‧前腰圍域1a側的端4b‧‧‧寬幅方向的(相同側的)外側端41‧‧‧吸收體芯片41a‧‧‧寬幅方向之外側(一方側)的端42‧‧‧覆蓋材5‧‧‧外裝薄片6‧‧‧腿圍伸縮性構件(伸縮性區域)6a‧‧‧寬幅方向之內側(中央側)的端10‧‧‧黏扣帶(固定黏著構件)13‧‧‧被黏扣標的薄片14‧‧‧被黏扣標的帶15‧‧‧被黏扣標的顯示部15a‧‧‧後腰圍域1c側的端15b‧‧‧寬幅方向的外側端A‧‧‧重疊區域CL‧‧‧寬幅方向的中心位置L1、L2、L3、L4、L5‧‧‧寬幅方向的長度A1‧‧‧重疊區域A的一端A2‧‧‧重疊區域A的另一端
