Provides an imaging device including, imaging element in which plural first lines arrayed with first phase difference detection pixels, and plural second lines arrayed with second phase difference detection pixels, are arrayed alternately; reading out section read out signals of the phase difference detection pixels; first correlation computing section carry out first correlation computation on signals read out from a set of the first and the second phase difference detection pixel; second correlation computing section carry out second correlation computation on signals read out from at least one set among a set of plural first phase difference detection pixels of the first line, and a set of plural second phase difference detection pixels of the second line; correcting section corrects results of the first correlation computation, by results of the second correlation computation; and focusing section control focusing based on the corrected correlation computation.