An endoscope contamination detection device 1 comprises an observation window 11d for emitting light having a specific wavelength to an endoscope and receiving fluorescence emitted by a contaminant attached to a surface of the endoscope, an image forming unit 19a which forms a first image from the received fluorescence, an image processing unit 19b which processes the first image and forms a second image in which the part contaminated by the contaminant is emphasized, and an output processing unit 19c which outputs the second image.
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