A white light source comprising: a blue light emitting diode having a light emission peak wavelength in a range of 421 to 490nm; and a phosphor layer including phosphor and resin and having a thickness of 0.01 to 3mm, wherein the phosphor comprises at least three or more types of phosphors that emit blue-green, green, yellow, and red light, respectively, the phosphor being composed of a combination of at least green, yellow, and red phosphor, wherein the white light source satisfies a relational equation of − 0.2 ≤ P λ × V λ / Pλ max 1 × Vλ max 1 − B λ × V λ / Bλ max 2 × Vλ max 2 ≤ + 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 the phosphor is excited by the light emitted from the blue light emitting diode, wherein the half-value width of the peak wavelength of the light emission spectrum of each phosphor is as wide as 40nm or more, wherein the red phosphor is excited by not only the light emitted from the blue light emitting diode but also a light emitted from the green phosphor, wherein the phosphor has an average particle diameter of 1 to 80pm, 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 490nm; and a phosphor layer including phosphor and resin and having a thickness of 0.01 to 3mm, wherein the phosphor comprises at least three or more types of phosphors that emit blue-green, green, yellow, and red light, respectively, the phosphor being composed of a combination of at least green, yellow, and red phosphor, wherein the white light source satisfies a relational equation of − 0.2 ≤ P λ × V λ / Pλ max 1 × Vλ max 1 − B λ × V λ / Bλ max 2 × Vλ max 2 ≤ + 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 the phosphor is excited by the light emitted from the blue light emitting diode, wherein the half-value width of the peak wavelength of the light emission spectrum of each phosphor is as wide as 40nm or more, wherein the red phosphor is excited by not only the light emitted from the blue light emitting diode but also a light emitted from the green phosphor, wherein the phosphor has an average particle diameter of 1 to 80pm, 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 the phosphor is excited by the light emitted from the blue light emitting diode, wherein the half-value width of the peak wavelength of the light emission spectrum of each phosphor is as wide as 40nm or more, wherein the red phosphor is excited by not only the light emitted from the blue light emitting diode but also a light emitted from the green phosphor, wherein the phosphor has an average particle diameter of 1 to 80pm, 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.