The present disclosure provides an image-capturing apparatus for determining an object distance with higher accuracy. An image-capturing apparatus includes an optical system that forms an object image of an object, the optical system including a focus lens, an image sensor that captures the object image formed via the optical system and generates image data, and a controller that determines an object distance according to information representing a state of the optical system based on (i) first image data generated when the focus lens is at a first focus lens position and (ii) second image data generated when the focus lens is at a second focus lens position.