A light source unit of the invention includes a first light source configured to emit light in a first wavelength range and a wheel in which a first transmitting area is formed, the first transmitting area being configured to transmit light in the first wavelength range incident from a side facing a first surface of the wheel, and the first transmitting area contains a first luminescent material configured to emit first luminescent light including at least a wavelength range of light in the first wavelength range by light in a second wavelength range whose wavelength range differs from that of light in the first wavelength range being shined from a side facing a second surface of the wheel, the second surface being opposite to the first surface.