An optical waveguide member including a first cladding section, a second cladding section joined to the first cladding section, and core sections formed between the first and second cladding sections. The first cladding section includes a major portion including a first surface and an opposite second surface, and an auxiliary portion formed along one side edge and including a reflecting surface. The core sections includes a first set of core sections formed along a plurality of grooves provided on the first surface of the first cladding section, and a second set of core sections formed along a plurality of grooves provided on the second surface of the first cladding section. Both of light propagating through the first set of core sections and light propagating through the second set of core sections are reflected at right angle by the reflecting surface and propagate through the auxiliary portion of the first cladding section.