A busbar of the present invention increases yield per metal material in comparison to plate-shaped bus bars, enables provision of protrusions on a member located inside relative to a conductor, and enables formation of the busbar in a bent shape. The busbar of the present invention is provided with a busbar insulator (22), a busbar conductor (23), a busbar insulator (24), a busbar conductor (25), and a busbar insulator (26) formed outside of a busbar center conductor (21). These conductors and insulators are arranged alternately from the inner side towards the outer side in a radial direction (R) that intersects at right angles with the axial direction (A) of the bus bar. The busbar conductors (23, 25) are provided with openings (23o, 25o) along the whole length in the axial direction (A) thereof.