An optical waveguide element includes: a substrate; and a plurality of optical waveguides causing light to turn between a first direction and a second direction that is an opposite direction of the first direction in a plane of the substrate, the plurality of optical waveguides includes first portions extending in the first direction with a predetermined distance therebetween, second portions extending in a third direction that is different from the first direction, and third portions extending in the second direction, and each of the plurality of optical waveguides except for the optical waveguide in which the second portion extending in the third direction is located on an innermost side in the first direction intersects, at the third portion, another optical waveguide in which the second portion extending in the third direction is located further inward in the first direction.