Abstract
Mountains rescue and a firefighter's rescue operation in the disaster site of an earth-flow disaster have much difficulty. Their activity place has much rubble with a sloping ground or an irregular ground, and cannot perform prompt movement. In the irregular ground or a sloping ground, the assistant suit needs to have the free motion which does not bar activity, and the motion which assists a joint. In order to work continuously by the irregular ground and sloping grounds, such as mountains rescue and the time of an earth-flow disaster, the leg power assistant suit aiming at mitigation of a physical load, extension of activity time, and injury prevention of the rescuer itself is developed.