An anti-reflection structure; includes: a plurality of convex parts
arranged at pitches each of which is shorter than a wave length of a
visible light ray, each of the convex parts being formed into one of a
substantially truncated cone and a substantially truncated pyramid, each
including: i) a base face formed into one of a base circle and a base
polygon inscribed in the base circle, a) the base circle and b) the base
circle circumscribing about the base polygon each having a base diameter
Db meeting the following expression: 100 nm