An image capturing apparatus includes an optical system having distortion aberration for expanding a central part and compressing a peripheral part of an object; a filtering device for cutting low-frequency components of each image signal; a filter setting device for assigning: first coefficients for cutting frequencies equal to or lower than a first frequency to an image area corresponding to the central part, and second coefficients for cutting frequencies equal to or lower than a second frequency higher than the first frequency to an image area corresponding to the peripheral part; a device for integrating each image signal and generating an evaluation value; a device for performing area division based on data relating to divided areas formed by dividing an effective image area, by setting each divided area for the integration device; and a device for controlling focusing based on the evaluation value with respect to each divided area.