Problem to be solved: to provide a stretchable composite material capable of easily forming a Gauss like irregular structure having one side or both sides on the one side or both sides by an expansion operation at the time of packing and transportation, and by use of the expansion operation.A stretchable composite material having a structure in which the interface between the first substrate A1 and the second substrate 2 is joined by the junction partThe first base material A1 is provided on one side of the second substrateThe first substrate A1 and the second substrate 2 areBoth are extensible substrates.In the stretching direction set for the extensible composite materialThe permanent strain at 50% elongation of the first substrate A1 is 2.5 to 25%The permanent strain at 50% elongation of the second substrate 2 is 0 to 10%；The permanent strain of the first substrate A1 is greater than or equal to 2.5% than the permanent strain of the second substrateThe junctionThey are spaced apart from each other in a pattern.AndA stretchable composite material characterized by the non joining portion 4 between the joining portions 3.Diagram【課題】梱包時、輸送時等にかさばらず、使用時に伸長動作により片面又は両面に風合いの良いギャザー状凹凸構造を容易に形成することができる伸長性複合材料を提供する。【解決手段】第１の基材Ａ１と第２の基材２との界面が接合部３により接合している構造を有する伸長性複合材料であって、前記第２の基材２の片面側に前記第１の基材Ａ１を有し、前記第１の基材Ａ１と前記第２の基材２とは、いずれも伸長性基材であり、前記伸長性複合材料に対して設定した伸長方向において、前記第１の基材Ａ１の５０％伸長時の永久歪が２．５～２５％であり、前記第２の基材２の５０％伸長時の永久歪が０～１０％であり、前記第１の基材Ａ１の永久歪は前記第２の基材２の永久歪よりも２．５％以上大きく、前記接合部３は、間隔を空けてパターン状に設けられており、且つ、前記接合部３どうしの間は非接合部４であることを特徴とする伸長性複合材料。【選択図】図１
