Light source device, image display device, and projector

A light source device comprising:

• a light emitting element configured to emit light;
• and
• a microlens array having a first multi-lens surface which the light emitted from the light emitting element enters, and a second multi-lens surface configured to emit the light which enters through the first multi-lens surface, wherein
• the light which enters the first multi-lens surface has an angular distribution,
• the first multi-lens surface has a plurality of first cells arranged in an array,
• the second multi-lens surface has a plurality of second cells arranged in an array,
• light proceeding from one of the first cells toward the second multi-lens surface has a first light beam which enters one second cell, and a second light beam which enters another second cell different from the one second cell,
• a first area of an illumination target is irradiated with the first light beam, and
• a second area of the illumination target different from the first area is irradiated with the second light beam.