A swinging base 12 is provided on top of a stationary base 11 such as to be capable of rotating by means of a bearing 13. A reduction gear 15 is provided in a depression portion 14 formed on the top surface of the stationary base 11. A motor 16 having a rotational shaft 17 connected to the reduction gear is provided on the swinging base. A cable support portion 21 which is rotatably supported by means of a bearing 18 provided on an axis A is provided inside the stationary base 11. The cable support portion 21 supports cables C. A through hole 23 is formed in the bottom of the swinging base 12. An arcuate aperture portion 24 is formed in the stationary base 11. The cables C are passed through the aperture portion 24 and the through hole 23. With this invention, cables which are installed in industrial robots can be supported without receiving excessive forces.