OPTICAL/ELECTRICAL MIXTURE MOUNTING BOARD AND METHOD FOR PRODUCING THE SAME

To provide an electrical and optical hybrid board that has on one surface an optical waveguide and on the other surface an electrical interconnect pattern or the like, in which the core pattern and electrical interconnect pattern or the like are positioned in place with high accuracy, and a method of manufacturing the same. The method includes: preparing laminate 4 of core layer 21 and clad layer 20 on an electrical wiring board; forming alignment mark 12 and electrical interconnect pattern 13 or electrical joint at the same time on a surface of the electrical wiring board opposite to a surface where laminate 4 is formed, alignment mark 12 used for forming a core pattern of optical waveguide, the electrical joint used for connection with an external device; and forming a core pattern of optical waveguide on the basis of alignment mark 12 without using a photomask.