In an underpants-type diaper (1) according to the present invention, at least one of a front waist member (4) and a rear waist member (5) has: first regions (R1) provided on the outer sides, in the width direction W, of side edges (30E) extending in the longitudinal direction (L) of a region where an absorbent body (30) is disposed； and second regions (R2) provided on the outer sides, in the width direction W, of the first regions (R1). The extension stress of the first regions (R1) is configured to be smaller than the extension stress of the second regions (R2).本發明之短褲型紙尿布(1)，係前胴圍構件(4)及後胴圍構件(5)的至少一方具有第1區域(R1)和第2區域(R2)，該第1區域(R1)係設置在比沿著配置有吸收體(30)的區域的長邊方向(L)的兩側緣(3E)更靠寬度方向(W)外側，該第2區域(R2)係設置在比第1區域(R1)更靠寬度方向(W)外側，第1區域(R1)的伸長應力構成為比第2區域(R2)的伸長應力小。
