Oxide ceramic fluorescent material having rare earth diffused therein

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An oxide ceramic fluorescent material is provided comprising a polycrystalline ceramic sintered body of Y3Al5O12, Lu3Al5O12, (Y, Lu)3Al5O12, (Y, Gd)3Al5O12, or Al2O3 in which a rare earth element selected from Ce, Eu and Tb has been diffused from its surface as fluorescent activator. The concentration of the rare earth element is 1 wt % at a depth of 50-600 μm as measured from the sintered body surface and at least 1 wt % at any position nearer to the sintered body surface.