The phosphor element and illuminating device

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This phosphor element is provided with a support substrate and an optical waveguide provided on the support substrate and formed of a phosphor, wherein : an incident surface is provided at one end, in the longitudinal direction, of the optical waveguide; an emission surface is provided at the other end, in the longitudinal direction, of the optical waveguide; the phosphor is formed of a single crystal doped with rare earth element ions; and the optical waveguide has a thickness of 3-80 μm.