| 摘要 |
In an optical waveguide 10 with a light-emitting element to be used in the present invention, a core includes: a main path; and a plurality of branched paths branched at a plurality of branched points from the main path. The main path has two sides faced to each other, in which one side has a plurality of branched points and the other side does not have any branched points. The plurality of branched points are provided on a straight line substantially parallel to a light guiding direction of the main path. The width of the main path becomes narrower as the main path moves away from a light-emitting element. An angle &thetas; formed by the other side without a branched point and the light guiding direction of the main path is 0.3 to 1.7°.
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