An apparatus for aligning the near end to far end of bone marrow nail without X ray has a near aligning unit and a far aligning unit, which are a U-shaped part with widened leg and guide hole on the leg. The bone marrow nail is fixed to near aligning unit via a linking plate. Said near aligning unit is linked to far one via a rotary and adjustable spacing keeper. The spacing between said nail on near unit and far aligning unit can be adjusted by the spacing part to make the central axis of guidehole on the leg be concentric with the central axis of the relative slot or hole on bone marrow nail. |