There is provided a mold structure containing a substrate, and a plurality of convex portions formed in the shape of concentric circles at predetermined intervals on one surface of the substrate, wherein a cross-sectional shape of the convex portions with respect to a radial direction of the concentric circles is such that a middle width M of each of the convex portions with respect to a heightwise direction is greater than a width T of a top portion of each of the convex portions with respect to the radial direction of the concentric circles.