A light emitting device and a projection means

A light emitting device in this disclosure is provided with a semiconductor light emitting element that radiates light of a first wavelength and a first wavelength conversion unit that includes at least one type of first phosphor, is excited by light of the first wavelength, and radiates light of a second wavelength, which is different from the light of the first wavelength. The phosphor includes europium (Eu) as an activator, and the light of the first wavelength is irradiated onto the first wavelength conversion unit at a light density of 1 kW/cm2 or greater. Letting eta1 be the light output ratio for the light of the first wavelength incident to the first wavelength conversion unit and the light of the second wavelength radiated from the first wavelength conversion unit, the light output ratio eta11 when the light of the first wavelength is irradiated onto the first wavelength conversion unit at a light density of 5 kW/cm2 and the light output ratio eta12 when the light of the first wavelength is irradiated onto the first wavelength conversion unit at a light density of 2.5 kW/cm2 satisfies the relational equation 1 <= eta12/eta11 <= 1.17.