Abstract: The invention provides a nozzle tip for manufacturing a glass fiber having a deformed cross-section which is of a large deformation ratio in the cross-section. A plurality of projected edges are provided to extend downwardly from the distal end of a nozzle tip at its outer periphery. Molten glass coming out of an orifice is separated at an outlet of the orifice into a flow descending from the orifice center and flows descending along inner walls of the projected edges, and the flow descending from the orifice center is attracted toward the flows descending along the inner walls of the projected edges. As a result, a glass fiber having a deformed cross-section is produced which is protruding in its portions corresponding to the projected edges. The cross-section of the glass fiber produced by using the present nozzle tip has a deformation ratio not less than 2.3.