An optical waveguide for a touch panel which eliminates the need for alignment between the optical waveguide and a lens device, and a touch panel using the same. An end portion of a light-emitting core for emitting light beams and an end portion of a light-receiving core for receiving emitted light beams are formed as first and third lens portions so as to protrude from edge portions of an over cladding layer and to be exposed to outside air. The first and third lens portions have lens surfaces which bulge outwardly. The over cladding layer includes second and fourth lens portions formed as extensions of the over cladding layer and corresponding to the first and third lens portions, with the second and fourth lens portions spaced apart from the lens surfaces of the first and third lens portions. The second and fourth lens portions have lens surfaces which bulge outwardly.