An optical connector end face grinding apparatus comprises a grinding apparatus main body, a sliding plate and a grinding bolder. The grinding apparatus main body further comprises an eccentric member driven by a motor and a guide pin. The sliding plate further provides a grinding pad on which is disposed a grinding film and moves in a reciprocal action along a guide pin in synchronism with the circular movement of the rotation of the eccentric member. An optical connector with a ferrule can be attached to and detached from the grinding holder, which positions the end face of the ferrule in a predetermined position relative to the grinding film in the rotational center of the eccentric member.