To provide a slip ring inexpensive and superior in reliability.

The slip ring 20 includes a plurality of conductive rings 21 electrically connected to a pan unit 13, a plurality of conductive brushes 30 electrically connected to a fixed power supply part, and a conductive ring fixing shaft 23 to fix the conductive rings 21. Moreover, this is equipped with a shaft part 25 which becomes the rotation center of the conductive ring fixing shaft 23. Then it has a structure that the plurality of the conductive rings 21 are positioned and fixed on the same shaft by rotating the conductive ring fixing shaft 23 for a constant angle against the shaft part 25 while securing insulation.