An illumination device includes a first light source section which includes at least one first light emitting element adapted to emit first colored light collimated, and is adapted to emit first light including the first colored light, and a light beam magnifying optical system adapted to magnify the first light. The light beam magnifying optical system includes first through fourth lens surfaces arranged in sequence from an incident side of the first light, the first lens surface is formed of a spherical surface having power, the second lens surface is formed of a first anamorphic surface having power with the same sign as the sign of the power of the first lens surface, the third lens surface is formed of a second anamorphic surface having positive power, and the fourth lens surface is formed of a spherical surface having positive power.