In an optical fiber spool, an optical fiber is wound around a barrel, a resilient pad covers the outer surface of the barrel, for relieving impacts, and two flanges face each other to support the barrel. A reinforcing rib is fixed on each of the flanges, for supporting the wound optical fiber, and an auxiliary winding portion is disposed on the outer surface of one flange, for winding a beginning portion of the optical fiber. An optical fiber drawing slot is positioned on the one flange, spaced apart from an inner circumference toward the flange in the direction of an outer circumference thereof by a predetermined distance, and has an upper surface spaced apart from the inner circumference of flange by a distance 2t, the thickness of the pad being t.
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