An optical connector adapter allowing a stopper member to be arranged at ends of an insertion hole while being overlaid on a shutter member is provided.In the optical connector adapter, a first base plate of the shutter member is fitted into a bottom wall recess, a second base plate of the stopper member is fitted into the bottom wall recess while being overlaid on the first base plate of the shutter member, first both side plates of the shutter member are fitted into a sidewall recess, and the second both side plates of the stopper member are fitted into the sidewall recess while being overlaid on the first both side plates of the shutter member.