An optical multiplexer/demultiplexer is provided, which is easy to assemble and which can be manufactured with high productivity and a low cost. An optical multiplexer/demultiplxer includes a substrate formed with V-shaped grooves, optical fibers with a lens provided in tight contact with the V-shaped grooves, optical fiber securing plates, a base groove formed across the V-shaped grooves and an optical filter provided in the groove. First and second optical fibers with a lens are provided on either side of the base groove, and a third optical fiber is provided on the other side of the base groove. The optical fibers are provided such that the positions of their ends coincide with edges of the base groove. The third optical fiber with a lens is provided coaxially with the first optical fiber with a lens that is located on the other side of the base groove. The second optical fiber with a lens is provided in a position in which it is in a line symmetrical relationship with the first optical fiber with a lens, the direction perpendicular to the base groove being the axis of symmetry. The ends of the optical fibers with a lens are formed at an angle such that lines normal to the end faces are orthogonal to the base groove.

 
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