PROBLEM TO BE SOLVED: To provide an accordion air bag for allowing buckling caused by external force to be hardly generated, while securing a large extension amount.SOLUTION: The accordion air bag 4 includes internal bending parts 11 which are bent to the inner side B of a bag body and arranged at least at a part of side surfaces 7-10 constituting an accordion part 6.COPYRIGHT: (C)2009,JPO&INPIT【課題】大きな伸張量を確保しつつ、外力による座屈が生じ難い蛇腹式のエアバッグを提供すること。【解決手段】蛇腹部6を構成する側面7~10の少なくとも一部に袋体の内側Bに向かって湾曲した内側湾曲部11を形成した蛇腹式のエアバッグ4である。【選択図】図1