PURPOSE: To keep a brush and a rotating cylindrical-electrode always in contact with each other, in a brush set which has the rotating cylindrical-electrode and brings the brush into contact with the electrode to transmit electric power/ signals.

CONSTITUTION: A brush set is composed of an electrode which is rotated in cylindrical shape and has a groove concentric to the center of that rotation, and also a brush 1 having its part cranked and its head bent in U-shape. The brush 1 and the electrode 2 are respectively incorporated in the brush set in such relation that the brush 1 is brought at its crossbar portion into contact with the inner circumferential wall-surface of the groove in the electrode 2 while being brought at the U-shaped portion of its head into the outer circumferential wall-surface of the groove in the electrode 2.