DEVICE FOR DETECTION OF FLUORESCENCE IN LIQUID AND METHOD FOR DETECTION OF FLUORESCENCE IN LIQUID

[Problem] To provide an in-liquid fluorescence detection device capable of accurately detecting fluorescence in a liquid. [Means for Resolution] A in-liquid fluorescence detection device including a light source 10 emitting an excitation light having a wavelength in which Raman scattering light is generated in a liquid in a wavelength band between first and second fluorescence wavelength bands toward the liquid which can contain a first substance which emits light having higher intensities in the first fluorescence wavelength band as compared with in the second fluorescence wavelength band and a second substance which emits light having higher intensities in the second fluorescence wavelength band as compared with in the first fluorescence wavelength band and a fluorescence detection unit 102 detecting light in the first and second fluorescence wavelength bands.