To provide a substrate for optics for enabling the color shift caused by diffraction of light to be reduced, a substrate for optics (12) is provided with a fine-structure layer including dots (31) comprised of a plurality of convex portions or concave portions extending in the direction of from a main surface of a substrate to outside the surface, the fine-structure layer has a plurality of dot lines in which a plurality of dots is arranged with a pitch (Py) in the first direction inside the main surface of the substrate, while having a plurality of dot lines in which a plurality of dots is arranged with a pitch (Px) in the second direction orthogonal to the first direction inside the main surface of the substrate, and both of the pitch Py and the pitch Px are inconstant intervals and are of nano-order.