A spectrum-encoded endoscopy optical device includes a bundle of multimode optical fibers that transmits light received from an imaging target to a spectrometer. The far field image of light transmitted through the fundamental mode of at least one of the multimode optical fibers is required to reduce the non-uniformity of the far field image at the input sensor of the spectrometer. A spectrally-encoded endoscopy optical device includes a bundle of multimode optical fibers that transmits light received from an imaged object to a spectrometer. The far-field image of light transmitted through the fundamental mode of at least one of the multimode optical fibers is non-parallel to the optical axis of the spectrometer in order to reduce the non-uniformity of the far-field image at the input sensor of the spectrometer. Is. To further reduce such inhomogeneities, the far-field pattern of light transmitted through the fundamental mode of the bundle of multimode optical fibers is non-parallel to the optical axis of the spectrometer. [Selection diagram] Figure 1
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