Abstract: There are provided a positive-electrode brush and a negative-electrode brush, which contact with a commutator to conduct electricity, a positive-electrode spring, which biases the positive-electrode brush against the commutator, a negative-electrode spring, which biases the negative-electrode brush against the commutator, and a partition member defining a fuel passage hole, through which fuel passes to a brush accommodating passage from a motor accommodating passage. The positive-electrode spring is arranged offset from the positive-electrode brush and the negative-electrode spring is arranged offset from the negative-electrode brush. Further, the fuel passage hole defined in the partition member is arranged between both the springs when being viewed from the rotation axis.