Abstract: An impact absorbing body for attachment to a door trim is capable of bearing a collision load from an exterior panel at the time of a side collision. The impact absorbing body has a top face portion with linear edge portions and sidewall portions extending from the linear edge portions toward the door trim to provide a hollow box. The impact absorbing body also includes base portions connected to edge portions of the sidewall portions. The base portions are open toward the door trim and are attached to the door trim. The impact absorbing body also includes slits between adjacent sidewall portions, and the sidewall portions have outwardly slanted portions. In addition, rib members extend from the top face portion toward the base portion, toward the inside of the hollow box, and connect the adjacent sidewall portions.