A projector includes first through fourth light emitters defining a placement region for fifth light emitters. The placement region is rectangular defined by first through fourth sides. The light intensity of a sixth light emitter closest to the middle of the first side is smaller than the light intensities of the first and second light emitters. Fifth light emitters arranged in a first direction from the center of the first light emitter toward the middle of the first side have light intensities that decrease toward the positive side in the first direction between the first light emitter and the sixth light emitter, and fifth light emitters arranged in a second direction from the center of the second light emitter toward the middle of the first side have light intensities that decrease toward the positive side in the second direction between the second light emitter and the sixth light emitter.