Light source unit and projector

A light source unit comprising:

• a first semiconductor light emitting device which is disposed centrally and a second semiconductor light emitting device which is disposed outwards of the first semiconductor light emitting device, the first semiconductor light emitting device and the second semiconductor light emitting device emitting lights;
• and
• a first collimator lens which is disposed centrally and a second collimator lens which is disposed outwards of the first collimator lens, the first collimator lens and the second collimator lens being disposed so as to correspond to the first semiconductor light emitting device and the second semiconductor light emitting device, respectively, on sides of the first semiconductor light emitting device and the second semiconductor light emitting device from which the lights are emitted, wherein
• a degree at which the light of the first semiconductor light emitting device is collected onto an illuminated surface differs from a degree at which the light of the second semiconductor light emitting device is collected onto the illuminated surface.