A white light source comprising: a blue light emitting diode having a light emission peak wavelength in a range of 421 to 490 nm; and a phosphor layer including phosphor and resin and having a thickness of 0.01 to 3mm, wherein the phosphor comprises at least four or more types of phosphors that emit blue-green, green, yellow, and red light, respectively, and the phosphor being composed of a combination in which at least green, yellow, and red phosphors exhibit mutual absorption between the phosphors, wherein the white light source satisfies a relational equation of − 0.2 ≤ P λ × V λ / P λ max1 × V λ max1 − B λ × V λ / B λ max2 × V λ max2 ≤ + 0.2 , assuming that: a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ) × V(λ) becomes largest is λmax1; and a wavelength at which B(λ) × V(λ) becomes largest is λmax2, wherein a mass ratio of the phosphor included in the phosphor layer is 5 mass% or more and 50 mass% or less, wherein the phosphor has an average particle diameter of 1 to 80μm, and wherein an amount of chromaticity change on CIE chromaticity diagram from a time of initial lighting up of the white light source to a time after the white light source is continuously lighted up for 6000 hours is less than 0.010. a blue light emitting diode having a light emission peak wavelength in a range of 421 to 490 nm; and a phosphor layer including phosphor and resin and having a thickness of 0.01 to 3mm, wherein the phosphor comprises at least four or more types of phosphors that emit blue-green, green, yellow, and red light, respectively, and the phosphor being composed of a combination in which at least green, yellow, and red phosphors exhibit mutual absorption between the phosphors, wherein the white light source satisfies a relational equation of − 0.2 ≤ P λ × V λ / P λ max1 × V λ max1 − B λ × V λ / B λ max2 × V λ max2 ≤ + 0.2 , assuming that: a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ) × V(λ) becomes largest is λmax1; and a wavelength at which B(λ) × V(λ) becomes largest is λmax2, wherein a mass ratio of the phosphor included in the phosphor layer is 5 mass% or more and 50 mass% or less, wherein the phosphor has an average particle diameter of 1 to 80μm, and wherein an amount of chromaticity change on CIE chromaticity diagram from a time of initial lighting up of the white light source to a time after the white light source is continuously lighted up for 6000 hours is less than 0.010. a light emission spectrum of the white light source is P(λ); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(λ); a spectrum of a spectral luminous efficiency is V(λ); a wavelength at which P(λ) × V(λ) becomes largest is λmax1; and a wavelength at which B(λ) × V(λ) becomes largest is λmax2, wherein a mass ratio of the phosphor included in the phosphor layer is 5 mass% or more and 50 mass% or less, wherein the phosphor has an average particle diameter of 1 to 80μm, and wherein an amount of chromaticity change on CIE chromaticity diagram from a time of initial lighting up of the white light source to a time after the white light source is continuously lighted up for 6000 hours is less than 0.010. <EOS>