Illuminator and projector

An illuminator comprising:

• a first light source that emits first light having a first color;
• a second light source that emits second light having a color different from the first color;
• a light combining member that combines the first light and the second light with each other and emits the combined light;
• a diffuser including a substrate having a diffusion surface that diffuses the combined light incident thereon and emits the diffused combined light, and a driver that rotates the substrate;
• a light collector that is disposed between the light combining member and the diffuser, collects the combined light, and causes the collected combined light to be incident on the diffusion surface of the diffuser;
• and
• a collimator that parallelizes the combined light emitted from the diffuser,
• wherein the first light source includes
• a plurality of first light emitters that each emit the first light having a first wavelength band,
• a plurality of second light emitters that each emit the first light having a second wavelength band different from the first wavelength band,
• a first heat dissipation member to which heat of the plurality of first light emitters is transferred, and
• a second heat dissipation member to which heat of the plurality of second light emitters is transferred, and
• a first heat dissipation capability of the first heat dissipation member and a second heat dissipation capability of the second heat dissipation member differ from each other.