An illumination light source emits white light resulting from mixing of light emitted from an LED chip and light emitted from a plurality of phosphors. A light emission spectrum of the white light has a peak in a wavelength range from 430 nm to 460 nm. In the light emission spectrum, a proportion of optical intensity at a wavelength of 510 nm relative to optical intensity at the peak is 0.45 or more, and a proportion of optical intensity at a wavelength of 580 nm relative to the optical intensity at the peak is 0.60 or more. Furthermore, in the light emission spectrum, a proportion of optical intensity at a wavelength of 650 nm relative to the optical intensity at the wavelength of 580 nm is 0.4 or less.
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