PROBLEM TO BE SOLVED: To provide an opto-electric composite wiring board that can realize high density optical parallel transmission, that can be manufactured at a low cost because of little restrictions on materials and manufacturing methods, and that can be easily miniaturized. SOLUTION: The opto-electric composite wiring board 10 is equipped with a plurality of optical waveguide layers 30, 31, an optical component supporting substrate 11, and a positioning guide member 44 for example. The plurality of optical waveguide layers 30, 31 are arranged by being mutually stacked and are provided with a core 33, a clad 34, an optical path switching part 37, and a positioning hole 36 opening on the main face on the optical waveguide layer side. Light is made to enter or exit through the clad 34. The optical component supporting substrate 11 is provided with the substrate main face 12 and a positioning hole 21 on the substrate side. The positioning guide member 44 is fittingly supported relative to the respective positioning hole 36, 21 on the optical waveguide layer side and on the substrate side in the plurality of optical waveguide layers 30, 31. COPYRIGHT: (C)2005,JPO&NCIPI