Provided is an optical touch panel. The optical touch panel includes: an optical waveguide including a core delivering an optical signal and a clad surrounding the core; a light generator delivering the optical signal into the optical waveguide; and a light detector measuring the optical signal passing through the optical waveguide, wherein the optical waveguide includes a sensing part having a sensing surface and a passing part having a non-sensing surface; the core includes a sensing core portion in the sensing part and a passing core portion in the passing part; and a distance between the sensing surface and a top surface of the sensing core portion is shorter than that between the non-sensing surface and a top surface of the passing core portion.