Because conversion from an invisible wavelength band to a visible wavelength band has been performed arbitrarily on a device-by-device basis, the color gamut in the visible color space could not be utilized sufficiently. A first aspect of the present invention provides an image-capturing device including: an image-capturing unit that is photosensitive to light in an invisible band; a generating unit that generates invisible wavelength information defined based on a sensitivity characteristic, which is an output characteristic of the image-capturing unit, to an object light flux wavelength for conversion of image-capturing data generated from an output signal of the image-capturing unit into visible color space image data; and a processing unit that relates the invisible wavelength information to the image-capturing data.