A coupling structure for coupling an optical waveguide and an optical device is provided. The coupling structure enables to precisely align the optical waveguide and the optical device so that an optical-alignment error can be reduced within a range of a few m. The coupling structure includes a first substrate, at least one optical waveguide formed on the first substrate to transmit an optical signal, optical alignment dummy waveguides symmetrically aligned on the first substrate about the optical waveguide, a second substrate bonded to the first substrate, at least one optical device mounted on a bottom surface of the second substrate and optically connected to the optical waveguide, and optical-alignment patterns formed at the bottom surface of the second substrate corresponding to the optical alignment dummy waveguides, wherein an optical alignment for the optical waveguide and the optical device is achieved by aligning the optical alignment dummy waveguides with the optical-alignment patterns.