Optical element, optical apparatus, and method for manufacturing optical element

An optical element comprising:

• an optical surface having an optical center;
• and
• an uneven structure including a plurality of concave portions on at least part of the optical surface,
• wherein the plurality of concave portions includes a first concave portion and a second concave portion arranged closer to the optical center than the first concave portion,
• wherein an outer edge of the optical surface is circular,
• wherein the optical surface is provided with a first group of concave portions including the first concave portion and a second group of concave portions including the second concave portion, the first group and the second group being arranged concentrically with respect to the optical center of the optical surface,
• wherein a shape of the first concave portion as viewed from a normal direction of the first concave portion has a length r1 in a radial direction from the optical center of the optical surface toward an end of the optical surface and a length r2 in a circumferential direction intersecting the radial direction,
• wherein a shape of the second concave portion as viewed from a normal direction of the second concave portion has a length r3 in a radial direction from the optical center of the optical surface toward the end of the optical surface and a length r4 in a circumferential direction intersecting the radial direction, and
• wherein the following relationships are satisfied:
• r1>r2, r3≥r4, r1>r3, and r2<r4.