An image capturing device includes: a housing; a reference pattern used for color measurement and arranged in the housing; an image capturing element that captures an image of the reference pattern in a first area and an image of an object in a second area of the image capturing area; an image forming element causing the image of the reference pattern and the image of the object to be formed on the image capturing element by being arranged on a first optical path between the image capturing element and the reference pattern and a second optical path between the image capturing element and the object; and an optical member that guides any one of the images of the reference pattern and the object formed by the image forming element so that the images are to be formed on an element surface of the image capturing element.