Lanthanoid-containing inorganic material microparticles, wavelength-converting ink, coated article

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A lanthanoid-containing inorganic material fine particle having a function of converting a wavelength of light to a shorter wavelength, the lanthanoid-containing inorganic material fine particle including : a core particle; and a shell layer, the core particle containing a lanthanoid having a light-absorbing function and a lanthanoid having a light-emitting function, the shell layer including at least an outer shell containing a rare earth element, the total amount of the lanthanoid having a light-absorbing function and the lanthanoid having a light-emitting function in the outer shell being 2 mol % or less based on the amount of the rare earth element contained in the outer shell, the outer shell having a thickness of 2 to 20 nm, the core particle and the shell layer having no interface at a contact face to form a continuous body.