An optical fiber cleaver includes a cleaver base body having a holder guide portion which positions a fiber holder holding an optical fiber, and a cleaver lid body attached to the cleaver base body to be openable and closable. A slider having a blade member piercing the optical fiber is attached to the cleaver base body to be movable in a width direction. A pawl member is arranged in one sidewall of the holder guide portion. Further, a count indication mechanism which counts and indicates the number of times the slider returns to an initial position is provided in the cleaver base body. The optical fiber cleaver is configured to enable a counting operation of the count indication mechanism only when the fiber holder is set in the holder guide portion such that the pawl member is pressed.