The present invention relates to an inorganic particle having a core shell structure, a process for producing the inorganic particle, and an optical film comprising the inorganic particle. The inorganic particle of the core shell structure according to the present invention comprises zirconium (Zr) and aluminum By having the core surround a shell containing a lanthanide element, high refractive index and transmittance can be exhibited. In addition, the surface-treated particles of the inorganic particles are excellent in compatibility with an acrylic resin, excellent in light transmittance, exhibit a low color coordinate, and thus can be usefully used in an optical film such as a prism sheet.
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