1. A method of manufacturing a mold that has on its surface an inverted structure of the eye of a moth, having many recesses, the two-dimensional size of which, observed in the direction normal to the surface, is at least 50 nm and less than 500 nm, the method comprising the steps of :( a) anodizing the surface of the aluminum base to form a porous alumina layer that has many tiny recesses; (b) after step (a) the porous alumina layer is brought into contact with the etching solution, thereby enlarging the multiplier a series of minute depressions of the porous alumina layer; and (c) after step (b), further anodize the surface of the aluminum base to grow many tiny recesses, while the voltage applied in step (c) is higher than the voltage applied in step (a) .2. The method according to claim 1, wherein the numerical density of the smallest recesses after step (c) is less than the multiplied by 1.26 the numerical density of the smallest recesses after step (a). 3. The method according to claim 1 or 2, wherein step (a) and step (c) are performed in the same electrolytic solution. The method according to claim 3, wherein the growth rate in the thickness direction of the porous alumina layer in step (a) is lower than the growth rate in the thickness direction of the porous alumina layer in step (c). 5. The method according to claim 1, 2 or 4, further comprising, prior to step (a), step (d), at which the surface of the aluminum base is anodized to form a barrier-type alumina layer. The method according to claim 1, 2 or 4, the average value of the intervals of the centers of the multitude of tiny recesses is at least 180 nm. The method according to claim 1, 2 or 4,
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