An ophthalmic surgical instrument provided with a nozzle part capable of sucking a liquid, wherein the nozzle part contains an inner pipe provided with an inner through-hole through which the liquid passes, and the inner pipe, and the liquid An outer tube provided with an outer through hole through which the outer tube passes, and the outer tube and the inner tube are disposed so as to be relatively movable, and the outer through hole and the inner through hole are arranged on the outer tube. A surgical instrument in which the overlapping region is arranged to be changeable by relative movement between the inner tube and the inner tube.液体を吸引可能なノズル部を備えた眼科用の手術器具であって、前記ノズル部は、前記液体が通過する内側貫通孔が設けられた内管と、前記内管を収容すると共に、前記液体が通過する外側貫通孔が設けられた外管と、を備え、前記外管と前記内管とは相対移動可能に配置されており、前記外側貫通孔と前記内側貫通孔とは、前記外管と前記内管との相対移動により、重複領域が変化可能に配置されている、手術器具。
