A stretchable section (8) configured to include a plurality of elastic members (81) of identical fineness (a fineness of 450 dtex or less) arranged in an elongated state between a topsheet and backsheet (2), (3) forms on a dorsal section (A) a lower stretchable section (8A1) in an absorber arrangement region (A1) and an upper stretchable section (8A2) in an absorber non-arrangement region (A2). The elastic members (81) of the lower stretchable section (8A1) have a non-stretchable section (82) at a portion overlapping with an absorber (4). The upper stretchable section (8A2) has a lesser stretching force than that of the lower stretchable section (8A1). Upper and lower ends (60p), (60q) of a tape base (60) are positioned in the vicinity of respectively corresponding outermost or innermost first imaginary straight lines (V1p), (V1q), and a major part of the tape base (60) is present in a region sandwiched by the two imaginary straight lines (V1p), (V1q). A major part of a tape holding section (61) is present in a region sandwiched by two second imaginary straight lines (V2), (V2).本發明之拋棄式尿布中,於背側部(A),使包含以伸長狀態配置在正背面片材(2)、(3)間之複數根相同纖度(纖度450 dtex以下)之彈性構件(81)而構成的伸縮部(8)在吸收體配置區域(A1)中形成下部伸縮部(8A1),而在非吸收體配置區域(A2)中形成上部伸縮部(8A2)。下部伸縮部(8A1)之彈性構件(81)中,於與吸收體(4)重疊之部分具有非伸縮部(82)。與下部伸縮部(8A1)相比,上部伸縮部(8A2)之伸縮力較小。帶基部(60)之上下端部(60p)、(60q)係分別位於相應之最外側或最內側第1假想直線(V1p)、(V1q)之附近,且帶基部(60)之主要部分係存在於由兩條假想直線(V1p)、(V1q)所夾之區域。帶握持部(61)之主要部分係存在於由2條第2假想直線(V2)、(V2)所夾之區域。4‧‧‧吸收體4a‧‧‧吸收體之背側部側之長度方向一端6‧‧‧黏扣帶8‧‧‧伸縮部8A1‧‧‧下部伸縮部8A2‧‧‧上部伸縮部10‧‧‧本體10a‧‧‧本體之背側部側之長度方向一端41‧‧‧伸出部60‧‧‧帶基部60p‧‧‧上端部60q‧‧‧下端部61‧‧‧帶握持部80‧‧‧薄片材料81‧‧‧彈性構件82‧‧‧非伸縮部A‧‧‧背側部A1‧‧‧吸收體配置區域A2‧‧‧非吸收體配置區域A3‧‧‧背側部之最大寬度部分L1‧‧‧相隔距離L2‧‧‧相隔距離L3‧‧‧相隔距離T1‧‧‧間隔V1p‧‧‧第1假想直線V1q‧‧‧第1假想直線V2‧‧‧第2假想直線V3‧‧‧第3假想直線W1‧‧‧帶基部之長度方向之長度W2‧‧‧帶握持部之長度方向之長度W4‧‧‧背側部之最大寬度部分之長度方向之長度W5‧‧‧吸收體之寬度方向之長度W6‧‧‧伸縮部之寬度方向之長度X‧‧‧長度方向Y‧‧‧寬度方向
