Automobiles have to be improved in the energy absorption capacity from the viewpoint of the collision safety, while the environment issues and the fuel efficiency have increased the need for the reduction of weight. In order to satisfy these contradictory requirements, thin-walled polygonal tubes are often used as energy absorbing members. In this study, the effects of crush angle, number of corners and testing speed on the crushing behavior of those tubes were investigated by quasi-static (strain rate: 10^<-4>/s), low-speed (10^<-2>/s) and dynamic (10^1/s) oblique crushing tests.