The number of ACF can be readily counted without overlooking the existence of ACF so as to achieve reduced observation time. Provided is a fluoroscopic device (1) including a light source unit (40) that is inserted into a body cavity of a biological organism and that emits excitation light onto an inner wall of the body cavity an image acquisition unit (20) that acquires image information by acquiring an image of fluorescence generated when GST-π-sensitive fluorescent probe having sensitivity to GST-π occurring in the inner wall of the body cavity are excited by the excitation light emitted from the light source unit (40) a position control unit (30) that moves the light source unit (40) and the image acquisition unit (20) relative to the inner wall of the body cavity and a counting section (72) that counts the number of fluorescence generation sites included in the image acquired by the image acquisition unit (20).
