A brush unit is attached to a conductor, and abuts on a shaft conductive part provided on a rotary shaft to electrically connect the conductor and the shaft conductive part. The brush unit includes a concave-shaped holder, a brush abutting on the shaft conductive part via an opening part of the holder, and a biasing part that biases the brush. The brush has a first brush part and a second brush part having a larger outer shape than the first brush part. A projecting part of the holder is opposed to a surface of the second brush part to which the first brush part is connected in a biasing direction of the biasing part.