The present invention has a simple configuration, minimizes discoloration of fluorescent pigment, prevents saturation of a white-light image signal, and ensures a sufficient quantity of fluorescent light. This fluorescent observation device is provided with: a light source means (10) for outputting white light and excitation light from a single light-emitting part that simultaneously emits white light and excitation light a light-guiding means (32) for simultaneously irradiating a device under test with the outputted white light and excitation light a white light imaging means (41) for acquiring a white light image from light returning from the device under test and a fluorescent light imaging means (42) for acquiring a fluorescent light image of fluorescent light produced by the device under test, the fluorescent observation device also having an illuminating light filter which is arranged between the light-emitting part and the output end of the white light and the excitation light, and which satisfies the following conditional expression. Pf (λw) < PF (λe) … (1), where Pf (λw) and PF (λe) are the optical transmittance of the illuminating light filter at a wavelength (λw) in the white light band and at a wavelength (λe) in the excitation light band.La présente invention a une configuration simple, réduit à un minimum une décoloration de pigment fluorescent, empêche une saturation dun signal dimage de lumière blanche et garantit une quantité suffisante de lumière fluorescente. Le dispositif dobservation fluorescent comprend : un moyen de source de lumière (10) pour émettre une lumière blanche et une lumière dexcitation dune partie démission de lumière unique qui émet simultanément une lumière blanche et une lumière dexcitation un moyen de guidage de lumière (32) pour rayonner un dispositif soumis à un test simultanément avec la lumière blanche et la lumière dexcitation émises un moyen dimagerie de lumière blanche (41) pour acquérir une image de lumière blanche à
