An optical connector which includes a body including a contact part having a contact groove, a cover having an outer surface on which a protruding lock region is formed, a first insertion part formed on one side end portion of the contact part, and a second insertion part formed on the other side end portion of the contact part. A holder is inserted to be slidable onto the contact part and the cover. A guide protrusion is formed to protrude from each side surface of the cover. A guide slot concavely formed on each inner side surface of the holder in a longitudinal direction of the holder. The guide protrusion is inserted into and guided by the guide slot. The guide slot includes an unlock region in which a vertical distance from an inner upper surface of the holder to a contact point of the guide slot.