Abstract: The structure of a rear view mirror mounted reversing distance sensor for automobiles having a housing, a cover, a spring and a retaining bracket. The housing and the cover together form a hollow, L-shaped structure when assembled. The housing has an upright part and a base. A channel is formed on the central portion of one lateral surface, opposite and parallel to the cover, of the upright part. The channel receives the retaining bracket at the uppermost portion of the channel, which also receives a first pad. A second pad is disposed over the entire top surface of the base. The retaining bracket is a flat sheet of metal bent to form an L-shape. The first leg, parallel to the cover, of the retaining bracket is formed a tab with a first hole therethrough for securing of one end of the spring.