1. A distance detection apparatus for measuring the distance to an object, comprising: sensor means including a plurality of light sensitive elements for receiving radiation from the object and for outputting electrical signals; a correlation detection circuit for detecting the correlation of the electric signals from predetermined groups of said light senitive elements and for forming signals respectively corresponding to information representing at least three different distances in a view field containing said object; means for weighting said signals formed by said correlation detection circuit with different weight factors respectively corresponding to the distance information to which the signals correspond, and putting out weighted signals representing said weighting; and detection means for detecting the signal among the weighted signals output by said weighting means and having a peak value.