A distance-measuring apparatus for a camera comprises an area sensor, an
integration circuit, and a switching circuit. The above-mentioned area
sensor receives light of a picture image in the image plane. The
integration circuit integrates output signals of this area sensor. The
control circuit controls operations of starting and stopping the
integration of the above-mentioned integration circuit, based on output
signals corresponding to a specific block of the above-mentioned area
sensor. The switching circuit switches the above-mentioned specific block
according to using state of the camera.
