An optical waveguide device according to the invention is provided with a substrate (271), a metal layer (272) arranged on the substrate (271), a plurality of claddings (262) arranged on the metal layer (207) via grooves (205), cores (202) arranged in the claddings (262) for transmitting lights, optical waveguides (201) having optically non-transmissive material (291) coating the insides of the grooves (205) and optically non-transmissive and electrically insulating material (273) coating the top faces of the claddings (262), and light receiving elements (203) for receiving lights emitted from the end faces of the cores (202). In an optical waveguide device according to the invention, dents (204) in which the end faces of the cores are exposed (202) may be formed, the inside faces of the dents (204) being coated with optically non-transmissive material except where the end faces of the cores are exposed. Also, in an optical waveguide device according to the invention, the cores (202) and the light receiving elements (203) may be paired and provided in a plurality each, and the light receiving elements (203) may be divided into odd-number and even-number groups, which are arranged with some spacing between them, the odd-number and even-number groups being blocked from each other by optically non-transmissive material (301).