To prevent the deterioration of an image by axial chromatic aberration.

An image acquisition part 104a determines a focus lens position for each color of R, G and B color-separated by filters of an imaging element 103, and acquires image data for each color by the imaging element 103. The image acquisition part 104a executes interpolation processing to the acquired image data for each color to form RGB data. An image file generation part 104b generates an image file based on the RGB image data.