A flexible polymer optical waveguide device which is excellent in mechanical strength and durability against environments, particularly excellent in heat and chemical resistance, with maintaining characteristics of an optical waveguide and which can be easily produced, and a process for the production thereof, the flexible optical waveguide device having a structure in which a cured resin layer is formed on at least one surface of an optical waveguide film obtained by forming a refractive index distribution in a light-permeable polymer film, the cured resin layer(s) comprising a polyamide resin and at least one of an epoxy resin and a phenolic resin as main components.