The present invention absorbent article represented by sanitary napkins and disposable diapers, mask, the provision of suitable gather member as the base material of the medical materials such as bandages. The present invention provides a gather member that is contained in elastic fibers, elastic fibers constituting the gather member repeats the third at 300% elongation stress at 300% elongation recovery repetition test (cN / dT) is is 0.050 more than 0.150 or less, repeated the third time 200% stress retention of at 300% elongation recovery repetition test (%) is 65 or more 95 or less, and, repeated the third time at 300% elongation recovery repetition test said gather member residual strain (%) is what is 42 or less after.BACKGROUND【課題】生理用品や使い捨て紙おむつに代表される吸収性物品、マスク、包帯等の医療用資材の基材として好適なギャザー部材の提供。【解決手段】弾性繊維が含有されたギャザー部材であって、該ギャザー部材を構成する該弾性繊維は、300%伸張回復繰り返し試験における繰り返し3回目の300%伸長時の応力(cN/dT)が0.050以上0.150以下であり、300%伸張回復繰り返し試験における繰り返し3回目の200%応力保持率(%)が65以上95以下であり、かつ、300%伸張回復繰り返し試験における繰り返し3回目後の残留歪み(%)が42以下であるものである前記ギャザー部材。【選択図】なし
