Abstract: An apparatus for aligning an optical source with an optical fiber. In the aligning apparatus, an optical source is installed on the substrate, an optical fiber is aligned with the optical source, for receiving light from the optical source, a holder holds the optical fiber to enable the optical fiber to receive a maximum of the light emitted from the optical source, and a fixture fixes the holder. The fixture includes a base fixed on the substrate and divided into two portions spaced from each other by a distance enough to insert the holder inbetween, a support having both ends integrally connected to the base, for supporting the holder inserted therein, a pair of protrusions extended from predetermined positions of both sides of the support along the length direction of the optical fiber, and a pair of connection portions disposed at both ends of each of the protrusions, for connecting to the holder.