A disposable diaper (10) includes: a front waist area (20) a back waist area (30) a crotch area (25) a pair of fastening tapes (90) an absorbent core (40a) a waist-encircling elastic portion (85) which is disposed at the rear edge of the disposable diaper and extends and retracts in the width direction a sheet material disposed overlapping the waist-encircling elastic portion and a joint portion row (87L) in which joint portions (87) which join the waist-encircling elastic portion to the sheet material are disposed spaced apart in the longitudinal direction. A plurality of the joint portion rows are disposed spaced apart in the width direction. The disposable diaper includes first regions (R1) which extend from both outside ends of the waist-encircling elastic portion toward the inside in the width direction, and which do not include the joint portion rows a second region (R2) which extends rearward from the front edge of the waist-encircling elastic portion, and which does not include the joint portion rows and third regions (R3) which are located to the inside of the first regions, in the width direction, are located further to the rear than the second region, and include the joint portion rows. The first regions are located further to the outside, in the width direction, than the absorbent core.用後即棄式紙尿布(10),具有:前腰圍區域(20)、後腰圍區域(30)、胯下區域(25)、一對黏扣帶(90)、吸收芯(40a)、配置在用後即棄式紙尿布的後端緣而沿寬度方向伸縮的腰圍伸縮部(85)、重疊配置於腰圍伸縮部的薄片材、以及接合部列(87L),該接合部列(87L)係將接合腰圍伸縮部和薄片材的接合部(87)沿長度方向隔著間隔配置。接合部列係沿寬度方向隔著間隔配置複數個。用後即棄式紙尿布且具有:第1區域(R1),從腰圍伸縮部的兩外側緣朝向寬度方向的內側延伸,不具有接合部列;第2區域(R2),從腰圍伸縮部的前端緣朝向後方延伸,不具有接合部列;以及第3區域(R3),位於比第1區域更靠寬度方向的內側並且位於比第2區域更後方,具有接合部列。第1區域位於比吸收芯更靠寬度方向的外側。10‧‧‧用後即棄式紙尿布20‧‧‧前腰圍區域25‧‧‧胯下區域30‧‧‧後腰圍區域35‧‧‧腿部開口部40‧‧‧吸收體50‧‧‧頂部薄片(薄片材)70‧‧‧側翼(薄片材)75‧‧‧腿部伸縮部80‧‧‧腿側伸縮部81‧‧‧彈性構件85‧‧‧腰圍伸縮部90‧‧‧黏扣帶91‧‧‧基材薄片92‧‧‧鈎薄片95‧‧‧目標部115‧‧‧第1缺口125‧‧‧第2缺口200‧‧‧褲襠伸縮部L‧‧‧長度方向W‧‧‧寬度方向
