An arm and lower back support device that is smaller in size, lighter and costs less. An arm and lower back support device (10) is provided with: an upper body frame (18) that is mounted on the back of a user； thigh arms (16) that are mounted on the lower limbs of the user； and arm support arms (20) that are mounted on the upper limbs of the user. In addition, the arm and lower back support device (10) comprises artificial muscles (22) which provide supportive force in the direction raising the upper body of the wearer, by urging the upper body frame (18) toward the thigh arms (16), and provide supportive force in the direction lifting the upper limbs of the user, by urging the arm support arms (20) toward the upper body frame (18).
