A cable winding device is provided, around which a cable unit is wound that includes a first connector, a first cable connected to the first connector, and a control unit connected to the first cable and controlling an amount of a current flowing through the first cable. The cable winding device includes a fixing portion, a rotating portion provided rotatably with respect to the fixing portion. The rotating portion includes a tube portion having an outer circumferential surface around which the first cable is wound, and a first holding portion provided within the tube portion and holding the control unit.