An imaging apparatus includes a prism for separating a first luminous flux into a plurality of second luminous fluxes, a plurality of imaging sensors disposed corresponding to the second luminous fluxes, an image generator for generating image data based on output image signals, and focus controller for executing a focusing operation based on focus detection image signals. The imaging sensors each have a plurality of imaging pixels and a plurality of phase difference pixels disposed in a specific pattern. An arrangement of a first imaging sensor, which is one of the plurality of imaging sensors, is different from an arrangement of a second imaging sensor, which is another one of the plurality of imaging sensors. The specific pattern is such that a position of a phase difference pixel of the first imaging sensor does not overlap with a position of a phase difference pixel of the second imaging sensor.