<p>Provided is an optical touch screen. The optical touch screen comprises: a display substrate having a plate-like observing part formed at the center of the substrate, step parts formed at edges of the substrate and protruding upward above the observing part, and space parts formed inside the step parts; a pair of a light-emitting part and light-receiving part inserted into the space parts of the display substrate and adapted to perform light emission and light receiving through an upper surface of the observing part by way of the step parts; and light- shielding parts embedded at the boundary between the observing part and the step part of the display substrate and shielding light transmission of the light-emitting part and the light-receiving part.</p>
