To provide an illumination optical device capable of making a light source image at a part near an illumination optical axis out of light source images formed on a light condensing element very small, and to provide a projector.
In the illumination optical device 2, an optical device 20 is arranged between a 1st lens array 412 and a light source device 411. The optical device 20 is equipped with an optical device main body 21 whose luminous flux emitting side surface is a concave surface 212, and an optical device main body 22 whose luminous flux incident surface is a convex surface 221. The concave surface 212 is curved and recessed from a center point 212A toward an outer circumference edge. The convex surface 221 has shape corresponding to the concave surface 212.
Kanji Nakayama
Tsuyoshi Ishizaki
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