This disposable diaper (10) is provided with a leg extension/contraction section (75) that can extend/contract along the product lengthwise direction and is disposed along a leg-encircling opening section provided to the outside in the product widthwise direction with respect to an absorbent body. A supplemental extension/contraction section (76) that can contract along the product lengthwise direction is provided at the gap between the leg extension/contraction section and the absorbent body in the product widthwise direction the supplemental extension/contraction section is disposed biased to the back torso-encircling region side of the center in the product lengthwise direction and the elongation rate in the product lengthwise direction of the supplemental extension/contraction section is greater than the elongation rate in the product lengthwise direction of the leg extension/contraction section.【課題】肌への刺激を抑制しつつ、着用者の脚に動きに追従できる使い捨ておむつを提供する。【解決手段】使い捨ておむつ10は、吸収体よりも製品幅方向外側に設けられた脚回り開口部に沿って配置され、製品長手方向に沿って伸縮可能なレッグ伸縮部75を備える。製品幅方向における吸収体とレッグ伸縮部との間には、製品長手方向に沿って収縮可能な補助伸縮部76が設けられており、補助伸縮部は、製品長手方向の中心より後胴回り域側に偏倚して配置されており、補助伸縮部の製品長手方向の伸長率は、レッグ伸縮部の製品長手方向の伸長率よりも高い。【選択図】図1
