To properly place a bracket onto a bracket mounting part.

A bracket comprises: a bracket fixing hole for inserting a screw part of a bracket fixing screw for mounting the bracket on a bracket mounting part of a housing, a clamp hole that for mounting a cable clamp; and at least two notches for positioning the bracket to at least two convex parts formed on the bracket mounting part. The bracket fixing hole is opposed to the clamp hole across a first line segment that connects parts of the two notches. A second line segment that connects the center of the bracket fixing hole and the center of the clamp hole crosses the first line segment at right angles. The center of gravity is closer to the bracket fixing hole than the first line segment is.