An optical fiber connector has a first ferrule holding an end of a first optical fiber, a first fiber stub connected to the first ferrule, a second ferrule holding an end of a second optical fiber, and a second fiber stub connected to the second ferrule. The first fiber stub enlarges the beam diameter of light transmitted through the first optical fiber, and produces the collimated light. The second fiber stub reduces the beam diameter of the collimated light, and leads the converging light into the second optical fiber. The first and second fiber stubs are detachably connected inside a connection sleeve across a predetermined gap. First and second GI fibers contained in the first and second fiber stubs satisfy L1≧L2 and L1+L2≅½ pitch, wherein L1 and L2 represent the lengths of the first and second GI fibers, and one pitch is a sinusoidal period of the light transmitted therethrough.