An imaging apparatus according to the present invention includes an imaging unit configured to capture an image of an arbitrary object and output a plurality of image signals with different exposures and a focus detection signal, and a composition unit configured to compose the plurality of image signals with different exposures output from the imaging unit and output the composed image signal. In a case of time-sequentially capturing images in succession, the imaging unit outputs the focus detection signal instead of the plurality of image signals at a predetermined timing. The composition unit composes image signals by using image signals in a time-sequentially adjacent different timing instead of image signals missing at the predetermined timing.