The fine particles containing rare earth elements and the probe

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Fine particles whose excitation light is not UV light or the like which has negative effects on a subject to be analyzed. The excitation light is emitted stably, and has excellent light emitting efficiency. Also a fluorescent probe including : fine particles containing a rare earth element excited by light having a wavelength in a range of 500 nm to 2000 nm and thereby emit up-conversion emission; and a specific binding substance which binds to the fine particles containing a rare earth element.