A fluoroscopy apparatus (100; 101; 102; 103) comprising: a light source that irradiates a subject with excitation light and reference light; a fluorescence-image acquiring section that captures fluorescence emitted from the subject irradiated with the excitation light from the light source to acquire a fluorescence image; a reference-light-image acquiring section that captures return light returning from the subject irradiated with the reference light from the light source to acquire a reference-light image; a preprocessing section that multiplies at least one of the fluorescence image and the reference-light image by a coefficient (a) by which distance characteristics of fluorescence intensity and distance characteristics of return-light intensity acquired from a standard sample in advance are made directly proportional to each other to generate a correction fluorescence image and a correction reference-light image; a divided-image generating section that divides the correction fluorescence image generated by the preprocessing section by the correction reference-light image to generate a divided image; characterized in that the apparatus further comprises a threshold-setting section that sets a threshold based on a mean grayscale level (m) of pixels in the divided image generated by the divided-image generating section; an image-adjusting section that enhances contrast between a region with grayscale levels above the threshold set by the threshold-setting section and a region with grayscale levels below the threshold in the divided image; and a display that displays the divided image with the contrast enhanced by the image-adjusting section, wherein the threshold setting section is configured to update the threshold following with a variation in grayscale levels of the divided image. a light source that irradiates a subject with excitation light and reference light; a fluorescence-image acquiring section that captures fluorescence emitted from the subject irradiated with the excitation light from the light source to acquire a fluorescence image; a reference-light-image acquiring section that captures return light returning from the subject irradiated with the reference light from the light source to acquire a reference-light image; a preprocessing section that multiplies at least one of the fluorescence image and the reference-light image by a coefficient (a) by which distance characteristics of fluorescence intensity and distance characteristics of return-light intensity acquired from a standard sample in advance are made directly proportional to each other to generate a correction fluorescence image and a correction reference-light image; a divided-image generating section that divides the correction fluorescence image generated by the preprocessing section by the correction reference-light image to generate a divided image; characterized in that the apparatus further comprises a threshold-setting section that sets a threshold based on a mean grayscale level (m) of pixels in the divided image generated by the divided-image generating section; an image-adjusting section that enhances contrast between a region with grayscale levels above the threshold set by the threshold-setting section and a region with grayscale levels below the threshold in the divided image; and a display that displays the divided image with the contrast enhanced by the image-adjusting section, wherein the threshold setting section is configured to update the threshold following with a variation in grayscale levels of the divided image.