Provided is a depth detection apparatus having: a shift amount acquisition unit to acquire a provisional image shift amount; a filter processing unit to perform filter processing on one or both of the first and second signal; and a depth deriving unit to derive the depth information on an object, based on a positional shift amount between the filtered first signal and the filtered second signal. A phase term of the filter is a function generated by a second function by a coefficient, wherein the second function is generated based on a phase transfer function corresponding to the first or second pupil region and on the provisional image shift amount, and the coefficient is a real number greater than 0 and smaller than 1.