A spectral characteristic acquiring apparatus (10, 10a) comprising: a color data acquiring unit including a spectroscopic unit having a plurality of spectral sensors configured to receive reflected light from a plurality of positions from a surface of a conveyed object that has been irradiated with light to acquire color data of the object conveyed; a spectral characteristic calculating unit configured to estimate spectral characteristics of the conveyed object based on the acquired color data of the conveyed object using a preset transformation matrix; a first conveying unit configured to convey the object in a predetermined conveying direction Y; and a second conveying unit configured to convey the color data acquiring unit in a direction X intersecting the predetermined conveying direction Y; wherein the plurality of spectral sensors are arrayed in the predetermined conveying direction Y, characterized in that: the color data acquiring unit includes a reducing imaging lens for imaging reflected light from the conveyed object and arranged with its optical axis in a Z-direction orthogonal to the X-Y plane; the spectroscopic unit includes: a pinhole array, and a lens array, wherein the pinhole array is arranged at an image plane position in the Z-axis direction corresponding to where light incident from the reducing imaging lens forms an image; wherein each lens of the lens array is arranged at a position corresponding to a pinhole formed in the pinhole array, and has a diameter such that all light transmitted through the corresponding pinhole is incident upon the lens, and the spectroscopic unit also includes: a diffraction element and an imaging element, wherein the light beam transmitted through the respective lenses of the lens array are dispersed by the diffraction element so that diffraction images corresponding to the light beams are formed on the imaging element, and wherein each of the spectral sensors comprises one pinhole of the pinhole array, the lens of the lens array corresponding thereto, the part of the diffraction element dispersing the beam from the lens, and the part of the imaging element where the diffraction image of the beam is formed. a color data acquiring unit including a spectroscopic unit having a plurality of spectral sensors configured to receive reflected light from a plurality of positions from a surface of a conveyed object that has been irradiated with light to acquire color data of the object conveyed; a spectral characteristic calculating unit configured to estimate spectral characteristics of the conveyed object based on the acquired color data of the conveyed object using a preset transformation matrix; a first conveying unit configured to convey the object in a predetermined conveying direction Y; and a second conveying unit configured to convey the color data acquiring unit in a direction X intersecting the predetermined conveying direction Y; wherein the plurality of spectral sensors are arrayed in the predetermined conveying direction Y, characterized in that: the color data acquiring unit includes a reducing imaging lens for imaging reflected light from the conveyed object and arranged with its optical axis in a Z-direction orthogonal to the X-Y plane; the spectroscopic unit includes: a pinhole array, and a lens array, wherein the pinhole array is arranged at an image plane position in the Z-axis direction corresponding to where light incident from the reducing imaging lens forms an image; wherein each lens of the lens array is arranged at a position corresponding to a pinhole formed in the pinhole array, and has a diameter such that all light transmitted through the corresponding pinhole is incident upon the lens, and the spectroscopic unit also includes: a diffraction element and an imaging element, the color data acquiring unit includes a reducing imaging lens for imaging reflected light from the conveyed object and arranged with its optical axis in a Z-direction orthogonal to the X-Y plane; the spectroscopic unit includes: a pinhole array, and a lens array, wherein the pinhole array is arranged at an image plane position in the Z-axis direction corresponding to where light incident from the reducing imaging lens forms an image; wherein each lens of the lens array is arranged at a position corresponding to a pinhole formed in the pinhole array, and has a diameter such that all light transmitted through the corresponding pinhole is incident upon the lens, and the spectroscopic unit also includes: a diffraction element and an imaging element, a pinhole array, and a lens array, wherein the pinhole array is arranged at an image plane position in the Z-axis direction corresponding to where light incident from the reducing imaging lens forms an image; wherein each lens of the lens array is arranged at a position corresponding to a pinhole formed in the pinhole array, and has a diameter such that all light transmitted through the corresponding pinhole is incident upon the lens, and the spectroscopic unit also includes: a diffraction element and an imaging element, a diffraction element and an imaging element,