A body-holding device in which a combination comprised of: a main body base suspension fitting, a pair of side-holding arms which hold both sides of a person, a pair of shoulder-holding arms which hold both shoulders of the person, a crotch supporter which supports the person's crotch, a transmission mechanism which links the movement of the suspension fitting, respective holding arms and the crotch supporter, and locking elements which constrain and release the respective holding arms and crotch supporter, is installed on a main body base of the device which is fastened to an automobile seat. The device eliminates heavy labor performed by a person assisting disabled persons such as handicapped persons, persons suffering from illness and elderly persons, etc.; and in addition, the device eliminates heavy labor by assisting the body functions of able-bodied persons, and it also has a body-holding function as a shock-absorbing device or a life-saving device.