An assistance suit wherein, when an electric motor and rotary bodies that wind and unwind wires are provided to a drive device, the electric motor and rotary bodies are compactly combined. A drive device (17) is provided with: rotary bodies (25-28) that are positioned in the horizontal direction so as to be able to freely rotate around a rotation axis (P2) in the horizontal direction, and that wind and unwind wires (18,19); an electric motor (29) positioned in the horizontal direction below the rotary bodies (25-28); and a transmission mechanism (30) positioned in the vertical direction that spans the end on the output shaft (29a) side of the electric motor (29) to the end on the output shaft (29a) side on the left or right of the rotary bodies (25-28). The power of the electric motor (29) is transmitted to the rotary bodies (25-28) via the transmission mechanism (30), thereby the rotary bodies (25-28) are rotationally driven in the winding direction and the unwinding direction.