Illumination device and projector

An illumination device comprising:

• a first light emitting element configured to emit first light in a first wavelength band;
• a wavelength conversion element configured to convert a part of the first light into second light having a second wavelength band different from the first wavelength band and a third wavelength band different from the first wavelength band and the second wavelength band, diffuse another part of the first light, and emit a result;
• a second light emitting element configured to emit third light having the second wavelength band;
• a first optical element having a first area configured to transmit the first light to enter the wavelength conversion element, transmit fourth light having the second wavelength band out of the second light, and transmit the third light, and a second area configured to reflect the first light, and reflect the second light;
• and
• a second optical element configured to transmit the first light to enter the first optical element, and reflect the fourth light to enter the wavelength conversion element via the first area.