As for this invention, production method of the disposable diaper and the disposable diaper where the installation impression is good without controlling the absorption efficiency of the absorber in the time of installation, is offered. It is arranged on non skin this contact surface side of chassis, 2 at least in absorber in the territory where it is piled up 4 and thickness direction, it forms expansion and contraction which decreases the elasticity of said elastic nonwoven fabrics 9a and 9b section 25 low in elastic nonwoven fabrics 9a and 9b which consist with of the thermal welding fiber whose fusion point is lower than the thermoplastic fiber and the said thermoplastic fiber which possess elasticity. Low expansion and contraction section 25 is formed by the fact that it heats when elastic nonwoven fabrics material roll 19 is made to expand vis-a-vis the particular territory and it pressurizes.本発明は、装着時における吸収体の吸収性能を抑制することなく、装着感のよい使い捨ておむつ及び使い捨ておむつの製造方法を提供する。シャーシ2の非肌当接面側に配置され、伸縮性を有する熱可塑性繊維と該熱可塑性繊維よりも融点の低い熱融着繊維とで構成された伸縮性不織布9a、9bにおいて、少なくとも吸収体4と厚さ方向に重なる領域に、該伸縮性不織布9a、9bの伸縮性を低下させた低伸縮部25を形成する。低伸縮部25は、当該領域に対して伸縮性不織布原反19を伸長させた状態で加熱及び加圧を行うことで形成される。
