An optical element array (100, 1270) comprising: a plurality of optical elements, wherein the plurality of optical elements includes a first optical element arranged along a first direction and positioned by a first distance along the first direction from a center of an array region where the plurality of optical elements are disposed, wherein the first optical element has a bottom face that coincides with a face including the first direction and a second direction orthogonal to the first direction, wherein the bottom face has a first width along the second direction positioned at a first position in the first direction within the first optical element, and a second width narrower than the first width along the second direction positioned at a second position further from the center of the array region than the first position in the first direction within the first optical element, and wherein the first optical element has a first curvature radius and a first height that is the highest point within a first cross section when the first cross section is taken along the second direction at the first position, and a second curvature radius larger than the first curvature radius and a second height lower than the first height, which is the highest point within a second cross section when the second cross section is taken along the second direction at the second position. a plurality of optical elements, wherein the plurality of optical elements includes a first optical element arranged along a first direction and positioned by a first distance along the first direction from a center of an array region where the plurality of optical elements are disposed, wherein the first optical element has a bottom face that coincides with a face including the first direction and a second direction orthogonal to the first direction, wherein the bottom face has a first width along the second direction positioned at a first position in the first direction within the first optical element, and a second width narrower than the first width along the second direction positioned at a second position further from the center of the array region than the first position in the first direction within the first optical element, a first width along the second direction positioned at a first position in the first direction within the first optical element, and a second width narrower than the first width along the second direction positioned at a second position further from the center of the array region than the first position in the first direction within the first optical element, and wherein the first optical element has a first curvature radius and a first height that is the highest point within a first cross section when the first cross section is taken along the second direction at the first position, and a second curvature radius larger than the first curvature radius and a second height lower than the first height, which is the highest point within a second cross section when the second cross section is taken along the second direction at the second position. a first curvature radius and a first height that is the highest point within a first cross section when the first cross section is taken along the second direction at the first position, and a second curvature radius larger than the first curvature radius and a second height lower than the first height, which is the highest point within a second cross section when the second cross section is taken along the second direction at the second position.